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 _________________________________________________________________________________________________________________________ 15K Start Time: 8:00am Start Location: Grosse Ile Middle School Finish Location: Grosse Ile Airport Area ________________________________________________________________________________________________________________________ 5K RUN/WALK 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!
Hotels Near This Race
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15th Annual Rock CF Rivers Half Marathon & 5K 2027 — Grosse Ile, MI
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Race Travel Insurance
Don't forget travel insurance for March 21.
You've trained for months and booked a trip to Grosse Ile, MI.
A pre-race injury, a delayed flight, or a family emergency can derail the whole thing.
Travel insurance can help cover your race entry fee, hotel, and flights if you can't make it,
and may cover medical costs if something goes wrong on the course. Plans typically only run
5-7% of your total trip cost — and running events are covered under standard plans with no
additional coverage needed.
Trip cancellation up to 100% of prepaid costs
Running events covered under standard plans — no add-ons needed
Trip interruption up to 150% of non-refundable costs
When is 15th Annual Rock CF Rivers Half Marathon & 5K 2027 — Grosse Ile, MI?
15th Annual Rock CF Rivers Half Marathon & 5K 2027 — Grosse Ile, MI takes place on March 21, 2027. The race is held in Grosse Ile, Michigan.
Where is 15th Annual Rock CF Rivers Half Marathon & 5K 2027 — Grosse Ile, MI held?
15th Annual Rock CF Rivers Half Marathon & 5K 2027 — Grosse Ile, MI is held at 23270 E River Rd in Grosse Ile, Michigan.
Where can I find hotels near 15th Annual Rock CF Rivers Half Marathon & 5K 2027 — Grosse Ile, MI?
RaceHotelFinder shows hotels sorted by distance from the race venue in Grosse Ile. Use the map or list view on this page to compare options and book race weekend accommodation.
