23270 E River Rd, Grosse Ile MI
Sunday, March 22nd, 2026
Race Overview
THE ROCK CF RIVERS HALF MARATHON IS BACK!
Join us as we Outrun Cystic Fibrosis!
Date: 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.
Capacity Limits
- Half Marathon Cap: 800
- 15K Cap: 300
- 5K Run/Walk Cap: 500
Half Marathon Details
- 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 Details
- Start Time: 8:00am
- Start Location: Grosse Ile Middle School
- Finish Location: Grosse Ile Airport Area
5K Run/Walk Details
- 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!
Registration
For more details, visit the official race page: Rock CF Rivers Half Marathon & 5K.
Course Map
Suggested Races
Find The Run Newsletter