Rock CF is hitting the island for the 14th Annual Rivers Half Marathon on Sunday, March 9th, 2025 for all to come and help us outrun cystic fibrosis! Join us for a beautiful lap around Grosse Ile, Michigan for our Half Marathon, 5K, or Virtual Run from wherever you are.

100% of all proceeds go towards supporting the mission of the Rock CF Foundation. Learn more and register through our RunSignup page by clicking the button below!

Half Marathon - 8:00am from Grosse Ile Miccle School

5K - 8:15am from Grosse Ile Naval Hangar

Learn more & register here: https://runsignup.com/Race/MI/GrosseIle/rockcfrivers