RACE PROFILE

15TH ANNUAL ROCK CF RIVERS HALF MARATHON & 5K

Grosse Ile, Michigan·Half Marathon

Next Race · Mar 2027

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 2026 Half Marathon Cap = 800 15K Cap = 300