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 2026 Half 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 ________________________________________________________________________________________________________________________ 5K RUN/WALK Start Time: 8:15 am Start Location:  Grosse Ile Airport (South of Naval Hangar) Finish Location: Grosse Ile Middle School _________________________________________________________________________________________________________________________ VIRTUAL RUN We will be sending out packets the week of the race so that you can participate with us from wherever you are! Whether that be a walk around the block or a full half marathon, we can't wait to see what you accomplish. Be sure to tag us on our socials @LetsRockCF so we can share your journey and runs!