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JAN 1

PPRR Sunrise Striders Training Runs

Colorado Springs, CO
Training runs on Tuesday and Thursday mornings in the Pikes Peak region beginning at 6AM, rain or shine, snow or sleet. Registered runners are notified via a weekly email with specific location, time and workout.
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MAY 2

Fifty States Half Marathon Club General Membership

Colorado Springs, CO
Join the Journey! Register for Fifty States Half Marathon Club "General Membership"! General Membership: $85 to join (then annual dues each year after, currently $35.00 per year). You may save on online processing fees by registering directly at website. We are a 50 States Running Club with MULTIPLE challenges to work on simultaneously as a member. No time limits to finish any challenge. No minimums to join! Lots of fun and motivation.  Whether you are a half marathon walker, runner, slow or fast, road runner, trail runner or triathlete, we have a challenge for you. Nice Awards! We also host a fabulous Member Party and Awards Night in a new state each year, and members plan meet up at races and race weekends throughout the year!  Join the Journey!   Visit our 50 States Half Marathon Club website for more detailed membership information. https://www.50stateshalfmarathonclub.com
Half Marathon
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OCT 27

50 States Half Marathon Club Life Membership

Colorado Springs, CO
Join the Journey! Register for 50 States Half Marathon Club "Life Membership"! $429 includes: Joining Fee, a complimentary club shirt, a complimentary official member sticker or magnet, unlimited complimentary awards for finishing club challenges and milestones, no annual dues ever (currently $35.00 per year for general members), first dibbs on free entries given to our club, race discounts, and a great club with fun members owned & operated full time by a USA Veteran (veteran owned small business)! Multiple challenges to work on simultaneously. No time limits to finish any challenge. No minimums to join!  Lots of fun and motivation.  Whether you are a half marathon walker, runner, slow or fast, road runner, trail runner or triathlete, we have a challenge for you. Visit our website for more detailed information. https://www.50stateshalfmarathonclub.com
Half Marathon
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SEP 4

PLAYTRI - IRONMAN 70.3 BOULDER

Boulder, CO
PLAYTRI - OFFICIAL TRIATHLON STORE OF IRONMAN We bring our expert in-house mechanics and triathletes to IRONMAN® Events and offer the highest quality rentals, repair and maintenance services for you and your bike. From race ready tunes up to complete overhaul packages, we'll keep you riding and racing smooth on the road! We are a full-service shop available onsite to take care of additional services leading up to and on race day.
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SEP 30

2026 Suicide Prevention Color Walk/Run

Center, CO
2025 Suicide Prevention Color Walk/Run – 5K & 2K 📍 386 S Broadway St, Center, CO 📅 September 26, 2026 at 9am. Join us for the 2026 Suicide Prevention Color Walk/Run in Center, Colorado! This family-friendly event brings our community together to raise awareness, spread hope, and support mental health. Whether you choose the 5K or 2K route, you’ll be part of a vibrant day filled with color, movement, and connection. 💜 Along the course, students will shower participants with bursts of bright color powder, creating a powerful symbol of hope, resilience, and community support. 👟 All ages and fitness levels are welcome – run, jog, or walk at your own pace.  👕 Registration includes a commemorative event t-shirt. Wear it proudly and watch it transform into a rainbow of colors by the finish line! This event is more than a race – it’s a celebration of life, a reminder that no one walks alone, and an opportunity to show support for suicide prevention a
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NOV 10

Tuesday Night Track

Fort Collins, CO
A local group of fun, energetic runners of all abilities who come together on Tuesday nights to do speed interval workouts together. The group was created by Jane Welzel, an amazing runner and friend who we honor by carrying forth her message of love, peace and run happiness.In addition to Tues speed work, the group helps produce the NOCO All-Comers Track Meets and the Bacon Strip Race. We are also active in the greater local running community. Visit our website to learn more
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DEC 1

Comp

Colorado Springs, CO
Comp
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DEC 14

Run the Ranch Training Runs

Loveland, CO
Choose 1, 2,  3 or all 4 training runs! You can come and run on the course for Run the Ranch. You can run the 10K loop or the 5K loop! Each training run starts at 8am and ends at noon. You will need to bring your own food and water. There will be a sign-in AND a sign-out sheet. It is crucial that you do both. If we sell out and have a waiting list, priority will go to those registered for one of the races for Run the Ranch.
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DEC 18

Moonlight Race Series

Glenwood Springs, CO
We are a go for race #2!!! See you on the 15th! Sunlight Mountain  and Cripple Creek Backcountry are teaming up again to bring the Moonlight Race Series back for the 2025/26 season! We couldn't be more excited to to bring the uphill community together for 4 nights of type A fun!  Racers will have the option each night to race on a long or short course with multiple fast accents and downhills. The two courses will be the same for all four races(snow willing) so participants can see their progression in fitness, skinning, skiing and transitions throughout the season. Come out to push your own best time or just move casually with friends. We all know that we try a little harder when that bib is strapped on so come out and get your suffer fun on! There will be schwag, beers and hot chocolate waiting for you at the finish line! All racers are required to have a headlamp and a helmet. Remember to stay on our designated uphill routes while training.  Racer check in will be between 5:15pm
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JAN 1

South Suburban Race Series

Littleton, CO
The most family-friendly races in town! With inexpensive registration prices and optional race shirt purchases to save you money.   The South Suburban Race Series consists of six races throughout the calendar year. Participants earn points for finishing position that go toward overall scoring. Each male and female who accumulates the most points will win prizes and be crowned race series Champion. Free to participate. Race Series Perks Free ParkingAffordable RacesFamily FriendlyAccurate Course MeasurementPlenty of Toilets
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JAN 1

Segment Showdown

Fort Collins, CO
Thanks for your interest in taking part in the 2026 FCRC Segment Showdown (SS). This is a free program put on by the FCRC. The SS is open to both FCRC and non-FCRC members. We will give you segments to run and you will be entered in the drawing for prizes.  To be eligible for prizes,  you must be a member of the FCRC. Please join if you are not already a member. This program will run from January-March. It will include two runs per month. You will run each month’s segments before the end of the day on the last day of the month! Please register for the program and then join the FCRC Segment Showdown Group. Also remember, all your runs must be made public on Strava. Questions, please contact us at info@fortcollinsrunningclub.org.
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JAN 4

RunningU/Horsetooth Half Marathon Training

Fort Collins, CO
Join the Fort Collins Running Club (FCRC) for the 2026 Horsetooth Half Marathon Training Program presented by Bachus & Schanker. Training kicks off Sunday, January 4 with a 3-5 mile group run from New Belgium Brewing. The training program and weekly group runs are open to all. You don't need to be a member of the FCRC to participate, however it is highly recommeded that you join the club for the benefits you will receive, such as $20 off the Horsetooth Half, free entry into the Bacon Strip race (otherwise $30) and many others. Please register for the program to help us plan all activities. If you would like to take part in the FCRC's free monthly Tortoise & Hare races leading up to the Horsetooth Half, you will need to join the running club.  Learn more about the training program and check out the training plans at the race website. While the program is free to all, if you would like to help defer costs (logistics, post-run refreshments, etc), please use the donation bu
Half Marathon
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JAN 7

2026 C.O.P.S. WINTER RACE SERIES

Golden, CO
The Colorado Outdoor Pace Series ("C.O.P.S.") is a unique set of races presented by Golden Mountain Runners and Golden Endurance. The cost for a single race is $30.00.  The cost for the whole series (6-8 races) $100.00.  T Race Dates January 7, 2026 - 5KJanuary 21, 2026 - 45 Minute Timed RaceFebruary 4, 2026 - 10KFebruary 18, 2026 - 60 Minute Timed RaceMarch 4, 2026 - 15KMarch 18, 2026 - 90 Minute Timed RaceApril 1, 2026 (Backup Snow Date/Non-Series Bonus Race)April 15, 2026 (Backup Snow Date/Non-Series Bonus Race)
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JAN 15

2026 Aspen Snowmass Town Race Series presented by HEAD

Aspen, CO
The Town Race Series kicks off its 45th season on January 17th, 2026 as the longest running town race series in North America! The race series will be scored both on an individual and a team basis. There will also be a family class, which will challenge the parents and their children to spend time in gates together on the race days. The Aspen and Aspen Highlands Series will consists giant slalom and slalom races on Saturdays. The Snowmass Series will follow on Sundays with six giant slalom races. Both the Recreational and Advanced Division will be racing together on the same course.
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FEB 16

Vendors and Honorary Badge Signups

Aurora, CO
BE A VENDOR!   Thank you for your interest in becoming a vendor in RexRun For PAWSitivity 2026! Your support raises funding for the therapy K-9 program in Arapahoe County school systems. These special therapy K-9s serve in the community schools alongside School Resource Officers, providing emotional support to students in crisis and those with special needs.  A 10' x 10' booth space is $125 (tables and chairs are not included). Electricity is not available. Check-in and event set-up begins at 6:00am with event doors opening at 7:00am. You will need to be set up by 7:30am. The event ends at 12pm. Please do not tear down prior to 12pm.  This year we are offering two ways to pay for your booth space, either by check or credit card! By check: You will need to contact Michelle Bird at mbird@arapahoegov.com or call 720-874-4033 to secure a booth space. You will receive an information form to fill out to and mail in with a check of $125. You will sign a waiver at check-in. Please
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FEB 28

2026 Team CKF Running Series

Aspen, CO
The Chris Klug Foundation is a proud partner of Realbuzz and enjoys offering runners the opportunity to take on marathons and half marathons around the world. CKF runners have the opportunity to take on marathons such as the Tokyo, Berlin, and Miami marathons, among others. The Chris Klug Foundation uses the funds raised to make a difference and eliminate the wait for a transplant. Founded in October 2003 by Olympic Bronze Medalist and liver transplant recipient Chris Klug, CKF aims to promote lifesaving organ, eye, and tissue donation and work to improve the quality of life for those touched by transplantation. CKF uses the stories of organ donors, transplant candidates, and transplant recipients to inspire, alongside events, school courses, and webinars to educate. All with the end goal of encouraging individuals to give the gift of life and register as organ donors.
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MAR 1

The 30-Day Dogventure Challenge

Niwot, CO
Start anytime. Finish within 30 days. The 30-Day Dogventure Challenge turns everyday dog walks into small adventures. Walk or run with your dog, discover fun Dogventure moments along the way, and celebrate what you accomplish together. Most participants complete their Dogventure with about 10 to 20 walks over the month, but every adventure is different. Complete the challenge and earn your Dogventure shirt and matching dog bandana because adventure partners deserve rewards. How the Dogventure Challenge Works 1. Sign upYou are registered and ready to turn everyday walks into small adventures with your dog. 2. Start your DogventureWalk or run with your dog anytime, anywhere. Start whenever you are ready and complete the challenge within 30 days. 3. Discover Dogventure momentsAlong the way, capture at least 5 Dogventure photo moments during your walks. Examples include: Dog + sunriseDog + sunsetDog + trailDog + waterDog + another dogDog + wildflowerDog + scenic
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MAR 1

Louisville Spring Splash & Dash Series

Louisville, CO
Join us for a Kids’ Splash & Dash Series this spring at the Louisville Rec Center! Get ready for a fun, energetic winter racing experience! Each event features an indoor swim in the Louisville Rec Center pool, followed by a run on the outdoor trail. In the case of bad weather, the run will move indoors to the running track. This series is open to kids ages 6–14. Register for a single race or sign up for the full series. Athletes who complete all races will earn points toward becoming the Series Champion. Age Groups & Distances6–8 yrs: 50-yard swim / 0.65-mile run9–11 yrs: 100-yard swim / 1.3-mile run12–14 yrs: 150-yard swim / 1.95-mile run *Age is determined by the child’s age on December 31, 2026. This race is sanctioned by USA Triathlon, which means all participants must have a current annual USAT membership. If you don’t already have one, you will be prompted to purchase it during registration for $10. The membership is valid for 12 months and only needs to be purchased once
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MAR 14

2026 St. Patrick's Day 5K Virtual Run - Golden

Golden, CO
🍀 St. Patrick’s Day Virtual Run – Run Bold. Run Lucky. Run Strong. 🍀 Celebrate the spirit of St. Patrick’s Day with more than just luck — celebrate it with Pride! Choose one of two T-shirt Designs:- St. Patrick with Beer: Our exclusive Kelly Green performance tee features an intricate, art-inspired design that commands attention. Ornate gold detailing, dynamic movement, and bold St. Patrick’s Day elements come together in a rich, eye-catching composition that stands out against the vibrant green backdrop. It’s more than a race shirt — it’s a statement piece. - Leprechaun with Clover: The shamrocks, Celtic design, and bold green-and-gold palette instantly scream St. Patrick’s Day!Our St. Patrick’s Day Virtual Run is your chance to chase your goals, conquer your miles, and earn your pot of gold the only way that matters: one determined step at a time. Whether you're running your fastest 5K yet or simply getting out there to move, this run is about heart, resilience, a
5K
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MAR 14

2026 St. Patrick's Day 5K Virtual Run - Greeley

Greeley, CO
🍀 St. Patrick’s Day Virtual Run – Run Bold. Run Lucky. Run Strong. 🍀 Celebrate the spirit of St. Patrick’s Day with more than just luck — celebrate it with Pride! Choose one of two T-shirt Designs:- St. Patrick with Beer: Our exclusive Kelly Green performance tee features an intricate, art-inspired design that commands attention. Ornate gold detailing, dynamic movement, and bold St. Patrick’s Day elements come together in a rich, eye-catching composition that stands out against the vibrant green backdrop. It’s more than a race shirt — it’s a statement piece. - Leprechaun with Clover: The shamrocks, Celtic design, and bold green-and-gold palette instantly scream St. Patrick’s Day!Our St. Patrick’s Day Virtual Run is your chance to chase your goals, conquer your miles, and earn your pot of gold the only way that matters: one determined step at a time. Whether you're running your fastest 5K yet or simply getting out there to move, this run is about heart, resilience, a
5K
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MAR 14

2026 St. Patrick's Day 5K Virtual Run - Colorado Springs

Colorado Springs, CO
🍀 St. Patrick’s Day Virtual Run – Run Bold. Run Lucky. Run Strong. 🍀 Celebrate the spirit of St. Patrick’s Day with more than just luck — celebrate it with Pride! Choose one of two T-shirt Designs:- St. Patrick with Beer: Our exclusive Kelly Green performance tee features an intricate, art-inspired design that commands attention. Ornate gold detailing, dynamic movement, and bold St. Patrick’s Day elements come together in a rich, eye-catching composition that stands out against the vibrant green backdrop. It’s more than a race shirt — it’s a statement piece. - Leprechaun with Clover: The shamrocks, Celtic design, and bold green-and-gold palette instantly scream St. Patrick’s Day!Our St. Patrick’s Day Virtual Run is your chance to chase your goals, conquer your miles, and earn your pot of gold the only way that matters: one determined step at a time. Whether you're running your fastest 5K yet or simply getting out there to move, this run is about heart, resilience, a
5K
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MAR 14

2026 St. Patrick's Day 5K Virtual Run - Edgewater

Edgewater, CO
🍀 St. Patrick’s Day Virtual Run – Run Bold. Run Lucky. Run Strong. 🍀 Celebrate the spirit of St. Patrick’s Day with more than just luck — celebrate it with Pride! Choose one of two T-shirt Designs:- St. Patrick with Beer: Our exclusive Kelly Green performance tee features an intricate, art-inspired design that commands attention. Ornate gold detailing, dynamic movement, and bold St. Patrick’s Day elements come together in a rich, eye-catching composition that stands out against the vibrant green backdrop. It’s more than a race shirt — it’s a statement piece. - Leprechaun with Clover: The shamrocks, Celtic design, and bold green-and-gold palette instantly scream St. Patrick’s Day!Our St. Patrick’s Day Virtual Run is your chance to chase your goals, conquer your miles, and earn your pot of gold the only way that matters: one determined step at a time. Whether you're running your fastest 5K yet or simply getting out there to move, this run is about heart, resilience, a
5K
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MAR 14

2026 St. Patrick's Day 5K Virtual Run - Boulder

Boulder, CO
🍀 St. Patrick’s Day Virtual Run – Run Bold. Run Lucky. Run Strong. 🍀 Celebrate the spirit of St. Patrick’s Day with more than just luck — celebrate it with Pride! Choose one of two T-shirt Designs:- St. Patrick with Beer: Our exclusive Kelly Green performance tee features an intricate, art-inspired design that commands attention. Ornate gold detailing, dynamic movement, and bold St. Patrick’s Day elements come together in a rich, eye-catching composition that stands out against the vibrant green backdrop. It’s more than a race shirt — it’s a statement piece. - Leprechaun with Clover: The shamrocks, Celtic design, and bold green-and-gold palette instantly scream St. Patrick’s Day!Our St. Patrick’s Day Virtual Run is your chance to chase your goals, conquer your miles, and earn your pot of gold the only way that matters: one determined step at a time. Whether you're running your fastest 5K yet or simply getting out there to move, this run is about heart, resilience, a
5K
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MAR 14

2026 St. Patrick's Day 5K Virtual Run - Denver

Denver, CO
🍀 St. Patrick’s Day Virtual Run – Run Bold. Run Lucky. Run Strong. 🍀 Celebrate the spirit of St. Patrick’s Day with more than just luck — celebrate it with Pride! Choose one of two T-shirt Designs:- St. Patrick with Beer: Our exclusive Kelly Green performance tee features an intricate, art-inspired design that commands attention. Ornate gold detailing, dynamic movement, and bold St. Patrick’s Day elements come together in a rich, eye-catching composition that stands out against the vibrant green backdrop. It’s more than a race shirt — it’s a statement piece. - Leprechaun with Clover: The shamrocks, Celtic design, and bold green-and-gold palette instantly scream St. Patrick’s Day!Our St. Patrick’s Day Virtual Run is your chance to chase your goals, conquer your miles, and earn your pot of gold the only way that matters: one determined step at a time. Whether you're running your fastest 5K yet or simply getting out there to move, this run is about heart, resilience, a
5K
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MAR 22

All-Out Spring Fever

Golden, CO
From the base of Table Mountain and Colorado's spectacular foothills, All-Out Multicourse presents our 13th annual Spring Fever from Jefferson County's NAAC Stadium… easily accessible from several nearby highways. Along with its Endless Series sidekick in October, Kooky-Spooky, these 5K, 10K & Half Marathon courses will hug the shores of Arvada's Blunn Reservoir via the Ralston Creek Trail and will challenge the beginner and veteran athlete alike!
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MAR 22

Central Park 5k

Denver, CO
Is it spring or still winter?  We'll know when we run the Central Park 5k at the end of March!  Celebrate the end of winter with us on this flat and fast course in the historic Central Park neighborhood! ----------------------------------------------------------------------------------------------------------------------------------------- Race day info including packet pick-up info, race day schedule, course info, and MORE, can all be found by clicking "Race Info" above and navigating the drop-down menu!
5K
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MAR 23

Mountain Lions Track Program

Boulder, CO
The Mountain Lions Track running program, provides a fun and encouraging environment for Elementary school aged children (5 - 11 years), to learn the basics of middle distance running over a 6-week period. They will learn good running form, improve both speed and strength, in an environment that is focused on the enjoyment of running. All of our running programs are held twice a week after school, and at a different local City of Boulder or City of Louisville Park, that is convenient to you. Over the course of the 6-week program, participants will have the opportunity to compete in 2 x FREE track meets. These track meets are designed for the kids to gain confidence in themselves, and their running ability, with the focus on competing with kids that have similar times and abilities. RACES:TRACK MEET 1 - Sunday, April 12thThis meet will be an "Introductory to Track" clinic, and kids will compete in hurdles, a 400m and relay event. This clinic is designed for kids that have never
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MAR 28

The City Park Circuit, Powered by New Balance

Denver, CO
City Park Circuit Race Schedule: 9:00- Free and Fun Kids Quarter Mile (no registration necessary, just show up to race!)  9:15- Community Race (all paces welcome- walkers, strollers, dogs!)  9:45- Competitive Women's Race (sub 7:00 pace)  10:00- Competitive Men's Race (sub 6:00 pace) *All registered participants will receive a performance race tee with original artwork (see below), a gift from New Balance, free hydration products from RNWY, and a drink from Cerebral Brewing * This is a USATF Certified and Officiated event Packet Pickup at Runners Roost Denver on Friday, March 27th from 5:00-7:00 pm (check-in also available on race day, but supplies will be limited)  Post-Race Party at Cerebral Brewing (.25 miles from park) with a race day pint glasses for first 50 people to attend, and free beer shot (4 oz pour) for all racers   Top 3 Overall Male and Female: 1st place- Shoes from New Balance, 2nd & 3rd place- Runners Roost gift cards Top 3 Men's and Women's Maste
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MAR 28

Cryogenic Cannibal Chase

Estes Park, CO
Planning on some degenerate behavior at Frozen Dead Guy Days? Start your morning off right with an 8k ripper around Lake Estes.This race is the morning pre game for FDGD where you'll score a sick beanie and a hearty breakfast bagel from Village Bagels before the festival kicks off. Some years you might be able to out run the cannibals shirtless, others you might want a winter coat, wading through deep snow.    Course Map
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MAR 28

Race Through Colorado 1M, 5K, 10K, 13.1, 26.2 - Now Only $20!

Denver, CO
Complete this race anytime in 2026 Our Race Through America Virtual Race Series continues! Each month we will race through a different state, until we've race through all of the states in America! For this race we will be racing through the great state of Colorado! We will be donating 15% of each registration to a charity* who is the leading domestic hunger relief organization with a nationwide network of 200 food banks. We hope to help feed thousands with our Race Through America Series! What:  This is a virtual race. You choose to complete 1 Mile, 5K, 10K, 13.1, 26.2 or 50 Miles. You complete your race on your own and submit your time to us.  Then we ship your medal directly to you. When: Complete your race anytime in 2026 *Medals and bibs will ship out within 2 to 5 days of signing up.  Where:  You choose the course and you time yourself (you’ll report your finishing time to us). Why:  To celebrate the beautiful state of Colorado! COST:  $25, which includes your medal, bib and a
5K10K
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MAR 29

DU Run Into Spring 5k

Gunnison, CO
Celebrate the start of spring at Western Colorado University with the DU Run Into Spring 5K, a fun and welcoming community road race hosted by Delta Upsilon. This 5K loops around campus and is open to students, community members, runners, and walkers of all ability levels. Whether you’re looking to race, jog, or enjoy a relaxed spring run, this event is a great way to kick off the season in Gunnison Proceeds from the race will support Delta Upsilon and a charitable cause. Join us for a morning of movement, community, and springtime energy in the Gunnison Valley. COURSE DESCRIPTION: The 5K course consists of two counterclockwise laps on a paved road loop surrounding the Western Colorado University campus. The race begins on Adams Street. From the start, runners turn right onto Georgia Avenue and continue east. The course then follows Escalante Drive as it curves around the north and east sides of campus. Runners next take a left turn onto North Colorado Street, heading south, followed b
5K
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MAR 29

Spring Equinox

Wellington, CO
Celebrate Spring with an early season race on scenic country roads.
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MAR 29

The Grand Traverse

Crested Butte, CO
The Elk Mountains Grand Traverse was conceived by Jan Runge in the 1990s. The race’s genesis was partially based on the historical mail routes that connected the Colorado mining towns of Crested Butte and Aspen in the 1880s.  It also drew inspiration from the Patrouille des Glaciers, a point-to-point ski race in Switzerland which Runge had become familiar with in the 80s.  In 1998, with the help of the community, Runge sent a brave field of competitors from Crested Butte, over the Elk Mountains, to Aspen. It worked, and the Extraordinary Backcountry Ski Race was born. In 2012, event ownership was transferred to Crested Butte Nordic. The race is now a major fundraiser for the organization. In 2014 the Grand Traverse summer events were launched. Now the Grand Traverse features a winter ski race, a summer mountain run, and a mountain bike race.
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MAR 29

Cottonwood Glen T&H 12K

Fort Collins, CO
This is the 7th and final T&H of the 2025-2026 season. It will take place on Sunday, March 29th at Cottonwood Glen Park, with waves starting at 8:00am.  The race is for FCRC members only. Not a member? Join today! You must have a race bib to run the race. Don't have one yet? Please be sure to buy one before the race for $10. The same bib will be used for every T&H race. You will pick up your bib on race morning. Not interested in running? We love volunteers!
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MAR 29

Dance Marathon 5K

Fort Collins, CO
Come walk or run to help support Children’s Hospitals Colorado!
5KMarathon
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MAR 29

RMRR Spring Marathon Training Series #1

Thornton, CO
RMRR provides low-cost, low-keyed, supported, and timed training races for runners of all abilities. The races are planned to help you prepare for Boston, Colorado, Colfax, and other long spring races. We make it easy for you to work on your pace, your nutrition and drinking, and getting everything ready for your big race. 3/29/26 - 10mi & 20mi4/11/26 - 10mi & 20mi Sign up for one, or save money and choose the two race bundle. RMRR members get 50% off. The races begin at 8am, at the Platte River Trailhead Park, at 88th and Colorado, in Thornton. The courses are out-n-back. so we can accommodate almost any distance between 10-20 miles. Please note that for everyone's safety dogs or running strollers are not permitted on our courses.  Thanks for understanding.
Marathon
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APR 2

MCMS Tri w/ Miller & Ignacio

Cortez, CO
Apr 2, 2026Montezuma-Cortez HS TrackCortez, CO
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APR 3

Most Eggcellent Virtual Event

Buena Vista, CO
The Most Eggcellent event is going virtual!  Commit to a run or walk 5k or 10k - your own pace, location, and day - anytime on Easter weekend 2026 between Friday, April 3rd through Monday, April 6th. Easter is April 5, 2026. You’ll receive a race shirt and commemorative medal for your commitment to get out there!   More details will be on our website!  Link is below.
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APR 4

Always Hope Easter Run 5K/10K/13.1 DENVER/AURORA

Centennial, CO
🐣 Get ready to lace up your sneakers and chase some fun!Join us for the Always Hope Easter Run - a family-friendly, fun, and make memories that’ll last longer than chocolate eggs!   Overview:Run will sell-out QUICK! We will close off waves the moment they fill up. If waves are sold out, you can sign-up for the virtual run option or wait list. This is a smaller, private group run with a cap per wave. All paces and ages (under 18 with guardian) are welcome - Run or Walk!   There's no equipment or setup, this is a pure run with our coordinators to support you in a warm, stress-free setting! When you sign-up, we give you the support you need to help you achieve your goals and fitness. We also invite you to be part of our local run clubs that supports your fitness journey.  Timing: - Timing is Optional: You may track your time on an app (Strava, RunKeeper, Nike Run, etc) and submit your times with our easy form to be posted online. Or you can ask our coordinators to help keep tr
5K10K
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APR 4

Erie Easter Bunny Hop

Erie, CO
🐰 Inaugural Erie Easter Bunny Hop 5KSaturday, April 4th, 2026 | Erie, Colorado Join us on Saturday, April 4th for the Inaugural Erie Easter Bunny Hop 5K and help us launch a brand-new spring tradition in our community! This family-friendly 5K is designed for runners, walkers, families, and anyone who loves welcoming spring in a fun and festive way. Whether you’re chasing a personal best or strolling the course with friends, the Erie Easter Bunny Hop is the perfect way to get outside and celebrate the season. 🌷 What to Expect:Professionally timed 5K raceScenic course through ErieEaster Bunny photo opsSpring-themed race shirtsPost-race celebration with local vendorsThis isn’t just another race — it’s the first year of what we hope becomes a beloved annual Erie tradition. Bring your friends. Bring your family. Wear your bunny ears.Let’s run, hop, and celebrate together!
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APR 4

Slash The Mass Banked Slalom 2026

Snowmass Village, CO
Join us for the 13th Annual Banked Slalom event held at Snowmass. Competition is open to snowboarders only. Race against the pros or within your age division!
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APR 4

National Disabled Veterans Winter Sports Clinic 2026

Snowmass Village, CO
The National Disabled Veterans Winter Sports Clinic is the world leader in rehabilitation.​Participating Veterans experience “Miracles on a Mountainside” as they are provided with training in adaptive Alpine and Nordic skiing, sled hockey, scuba diving, rock wall climbing and a number of other adaptive activities, sports and education.​The clinic, which began in 1987 with 90 participants, has grown to assist nearly 400 profoundly disabled Veterans.​Veterans with traumatic brain injuries, spinal cord injuries, orthopedic amputations, visual impairments, certain neurological conditions and other disabilities are empowered to challenge perceived limitations by participating in adaptive sports that improve their overall health and outlook.​World-class instructors help Veterans achieve their maximum potential based on their unique capabilities. Along the way, it’s introduced dozens of Veterans to future glory as Paralympic athletes.​The five-day event is sponsored by the Department of Veter
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APR 4

Nielson Challenge

Colorado Springs, CO
IF YOU HAVE A FOREVER BIB THERE IS NO NEED TO REGISTER.  YOU ARE ALREADY PRE-REGISTERED EACH MONTH. RACE STARTS AT 8:00 A.M.   THE START LINE CLOSES AT 8:05 A.M. This is a 2 mile race held the first Saturday of each month.  You are running against your handicap, which is computed from your previous results for the last two years. The first time you run this event, you'll establish a base time for yourself. This base time is used to generate a handicap time. The handicap time is calculated using an algorithm developed by Bob Royse, and it's geared to favor a beginning runner and the slower runners. Click here for an explanation of the handicap algorithm. Once you have an established handicap, you are racing against your handicap time. The person who improves the most from their handicap time is the winner.  As mentioned before, the handicap does favor a beginning runner or a slower runner who is putting in a lot of quality training time, as it's these types of runners who te
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APR 4

Run for Breast Cancer 5K/10K/13.1 DENVER/AURORA

Centennial, CO
🎀 Join the Fight: Breast Cancer Run! 🎀 Lace up and make a difference at our annual Breast Cancer Run! Together, we can raise awareness and funds to support those affected by breast cancer.  Enjoy a spirited day filled with community, inspiration, and hope. Let’s unite for a cause that touches us all and run for a future without breast cancer! Sign up now and help us make a lasting impact!   Overview:Run will sell-out QUICK! We will close off waves the moment they fill up. If waves are sold out, you can sign-up for the virtual run option or wait list. This is a smaller, private group run with a cap per wave. All paces and ages (under 18 with guardian) are welcome - Run or Walk!   There's no equipment or setup, this is a pure run with our coordinators to support you in a warm, stress-free setting! When you sign-up, we give you the support you need to help you achieve your goals and fitness. We also invite you to be part of our local run clubs that supports your fitne
5K10K
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APR 5

Three Creeks Half Marathon

Englewood, CO
FULL WEBSITE AT:  http://www.racingunderground.com/threecreeks/   Welcome to Denver's Best Spring Half Marathon! Sunday April 5, 2026 at Cherry Creek State Park Racing Underground brings you an amazing half marathon this spring! The Three Creeks Half Marathon features a half marathon course that is flat, fast and scenic! Travel on foot through some of the most beautiful parts of Cherry Creek State Park, with a total combined elevation gain of only 291 feet spread out over 13.1 miles as the course follows the banks of Cherry Creek, Windmill Creek, and Cottonwood Creek on a mix of road, paved running trail, and wide dirt trails. We hope to see you at the 13th annual Three Creeks Half this April! Darrin, Jill,and the Racing Underground Crew
Half Marathon
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APR 6

The Impact Competition

Colorado Springs, CO
The Impact Competition is the first nationwide CrossFit and X-Training fundraising event designed to channel the power of fitness into local community change. Gyms, athletes, students, and supporters across the country compete in three arenas—Performance, Participation, and Philanthropy—all while raising funds that stay in their own communities. During a single week each spring, every participating gym completes the same national WOD, engages members of all ability levels, and rallies supporters to give what they can. Individuals and gyms climb the leaderboard by completing the workout, mobilizing their community, and raising critical dollars for local students, nonprofits, and causes. This is more than a workout.It’s a movement of gyms stepping forward together to lift their cities higher. Every rep matters. Every dollar counts. Every community wins. Join the Impact Competition and help turn collective effort into real, lasting change.
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APR 7

Garden Training Runs

Colorado Springs, CO
Training runs organized by the Pikes Peak Road Runners on Tuesday and Thursday mornings in at the Garden of the Gods main parking lot at 6AM, rain or shine, snow or sleet.  Protocol: We split into several groups based on ability.  Each group runs together (or at least starts together) at a pace that is generally within the ability of the group members.  The group lead can decide the route and any other training features, e.g., intervals, hill repeats, tempo, etc.  Workouts last about an hour (give or take a few minutes). Routes vary from workout to workout, and are usually within the confines of the Garden of the Gods Park, although sometimes a group will explore neighborhoods and trails that are adjacent to the park.Incentives: The beauty of running in the Garden is enough to get those endorphins exploding. The first 25 runners attending 8 or more workouts are given free swag, courtesy of Pikes Peak Marathon, Inc., and its Garden to Peak Challenge race series. Group training with othe
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APR 10

Run the Ranch

Loveland, CO
For the 6th year running and partnering with the Sylvan Dale Guest Ranch, we are bringing back an amazing and beautiful trail race to Loveland, CO. You will have 6 distances to choose from. Come run on beautiful trails on private land at Sylvan Dale Guest Ranch. The views alone are to die for! There are different terrains throughout the course, something to challenge everyone. We will have a 5K and 10K. On Saturday there will be a 4hr, 6hr, 12hr, and 12hr 4-person relay timed races. There is a ranch access fee that each person coming onto the ranch needs to purchase. $5/person per day. EVERYONE running will be provided a meal ticket. You can purchase an extra meal ticket for any friends or family coming, OR if you want two meals. 12-HR solo get an extra meal ticket. Finisher Awards for 5K, 10K, 4hr, 6hr, 12hr and 12hr 4-person relay! Picture coming soon. Start Times: April 10th -10K - 5:00pm April 10th -5K - 5:30pm April 11th-12 hr solo/ 12hr relay 2 and 4 person teams/6hr/4hr - 7:00am
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APR 11

ASDAsh 5K to Beat Tooth Decay

Aurora, CO
Join us for the University of Colorado School of Dental Medicine's 6th Annual ASDAsh 5K to Beat Tooth Decay! We are excited to share that our 5K course has been revamped this year to offer a fresh new route through campus. This year, we will be starting and ending at the LIBRARY COMMONS! Additionally, we're introducing the Meatball Mile, featured as mile 2 of the course. This section will be a designated Strava Segment, and there will be a prize for the participant who claims the title of KOM (King/Queen of the Mountain)! [Unsure what a Strava segment is? Check out this link: https://support.strava.com/hc/en-us/articles/216917137-What-s-a-segment]   This Year’s Donation: Veterans Assistance Grant  All proceeds from this year’s event will benefit the Veterans Assistance Grant (VAG), a program dedicated to providing essential support to veterans in Colorado. Your participation helps ensure these brave individuals receive the vital dental care they need through the CU Dental Team
5K
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APR 11

RMRR Spring Marathon Training Series #2

Thornton, CO
RMRR provides consistent and individualized marathon training opportunities for runners of all abilities. All races in the series are low cost, friendly, fully supported, and officially timed.The first two races, March 29 & April 11, are 10 Mile and 20 Mile races (runners choice for distance). The third race in the series is the Inaugural Blue Heron half marathon.  All you need to do is focus on your running!  Our races fit perfectly in training schedules for Boston, London, Colfax, and other spring full and half marathons. Everyone is welcome to Marathon Training Series races:  RMRR members, guests, training team members, everyone!  The course is clearly marked, and mile markers will help you gauge your time. Aid stations will have water, sports drink, and gels. Winners of each distance will receive ribbons and running store gift certificates. We make it easy for you to work on your pace, your nutrition and drinking, and getting everything ready for your big race. RMRR members get
Marathon
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