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

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15K 

Start Time: 8:00am

Start Location: Grosse Ile Middle School 

Finish Location: Grosse Ile Airport Area

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5K RUN/WALK

Start Time: 8:15 am

Start Location:  Grosse Ile Airport (South of Naval Hangar)

Finish Location: Grosse Ile Middle School

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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!