Events
Race Website
Additional race information can be found at https://letsrockcf.org/rock-cf-half.
Place
Start Time: 8:00 am
Start Location: Grosse Ile HIGH School (7800 Grays Dr. Grosse Ile, MI 48138)
Finish Location: Grosse Ile HIGH School
5K RUN/WALK
Start Time: 8:15 am
Start Location: Inside of the Naval Station Hangar (south side) 9601 Groh Rd.- Across from GI Township Shuttle Parking Lots).
Finish Location: Grosse Ile HIGH School
* Shuttles will run between the high school and the township parking lots from 6:00am-11:30am*
Description
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
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15K
Start Time: 8:00am
Start Location: Grosse Ile HIGH School
Finish Location: Grosse Ile Airport Area
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5K RUN/WALK
Start Time: 8:15 am
Start Location: Grosse Ile Airport (Naval Hangar)
Finish Location: Grosse Ile HIGH 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!
Race Contact Info
If you have any questions about this race, click the button below.
Directions
HALF MARATHON
Start Time: 8:00 am
Start Location: Grosse Ile HIGH School (7800 Grays Dr. Grosse Ile, MI 48138)
Finish Location: Grosse Ile HIGH School
5K RUN/WALK
Start Time: 8:15 am
Start Location: Inside of the Naval Station Hangar (south side) 9601 Groh Rd.- Across from GI Township Shuttle Parking Lots).
Finish Location: Grosse Ile HIGH School
* Shuttles will run between the high school and the township parking lots from 6:00am-11:30am*
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