location_city Grosse Ile
location_on Michigan
flag United States
calendar_today 22 Mar, 2026
directions_run Running
language Official Website
RegisterRock 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!
Mar 22, 2026
Distance — 15K
Type — Road running
08:00
Mar 22, 2026
Distance — 13.1 Miles
Type — Road running
08:00
Mar 22, 2026
Distance — Virtual Run
Type — Road running
08:00
Mar 22, 2026
Distance — 3.1 Miles
Type — Road running
08:15
These values represent the 3-year monthly averages for March in Grosse Ile.
Grosse Ile Township is a civil township of Wayne County in the U.S. state of Michigan. The population was 10,777 at the 2020 census.
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location_on Ann Arbor, Michigan, US
calendar_today Mar 07, 2026
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