15th Annual Rock CF Rivers Half Marathon & 5K

THE ROCK CF RIVERS HALF MARATHON IS BACK! Join us as we Outrun Cystic Fibrosis! Sunday, March 22, 2026 Rock CF is hitting the island for the 15th Annual Rivers Half Marathon, 5K Run/Walk & NEW 15K!  Rock CF is a community, thousands strong, changing the face of what living with cystic fibrosis looks like and giving those living with CF the tools to not only survive, but thrive. 100% of all proceeds support the mission of the Rock CF Foundation. Caps for 2026Half Marathon Cap = 800 15K Cap = 300 5K Run/Walk Cap = 500   HALF MARATHON  Start Time: 8:00am Start Location: Grosse Ile Middle School - 23270 E River Rd, Grosse Ile Township, MI 48138 Finish Location Grosse Ile Middle School - 23270 E River Rd, Grosse Ile Township, MI 48138 _________________________________________________________________________________________________________________________ 15K  Start Time: 8:00am Start Location: Grosse Ile Middle School  Finish Location: Grosse Ile Airport Area __________________________