7800 Grays Dr., Grosse Ile MI
Sunday, March 22nd, 2026
🏃♀️ 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 HIGH School
- Finish Location: Grosse Ile HIGH School
🏁 15K
- Start Time: 8:00am
- Start Location: Grosse Ile HIGH School
- Finish Location: Grosse Ile Airport Area
🚶♂️ 5K RUN/WALK
- Start Time: 8:15 am
- Start Location: Grosse Ile Airport (Naval Hangar)
- Finish Location: Grosse Ile HIGH 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!
For more information, visit the race page: Rock CF Rivers Half Marathon & 5K.
Course Map
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