2026 Cal Tri Castaic Lake - 6.20.26

2026 Cal Tri Castaic Lake - 6.20.25 18 EVENT OPTIONS. 6 Olympic distance events (Triathlon, RunBikeRun, SwimBike, SwimRun, 1640 Yard Swim & 10K Run), 6 Sprint distance events (Triathlon, RunBikeRun, SwimBike, SwimRun, 400 yard Swim & 5K Run) and 6 Youth Sprint distance events (Triathlon, RunBikeRun, SwimBike, SwimRun, 400 yard Swim & 5K Run). Triathlon = swim + bike + run. Typically, the swim and run distances are standard but the bike distance varies from race to race. Check out the course maps for more detailed information.CASTAIC LAKE. The 35th annual Castaic Lake Triathlon takes place at scenic Castaic Lake just 20 miles north of Los Angeles. The Castaic Lake Recreation Area, located just north of Santa Clarita, is an 11,200-acre multi-use facility with two lakes, boating, world class fishing, hiking, walking, horseback riding, wake boarding, jet-skiing, camping, picnicking, kayaking, and sailing.  August is a great time to enjoy the water in the high 60s, and a