15th Annual Rock CF Rivers Half Marathon & 5K

Grosse Ile, MI | Sunday, March 22, 2026Registration Open

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!

Elevation Gain:50 ft

Available Distances

Awards & Prizes

Participant Giveaway

13.1 Miles: Long Sleeve Tech Shirt

15K: T-Shirt

3.1 Miles: Long Sleeve Tech Shirt

Virtual Run: Long Sleeve Tech Shirt

Registration & Pricing

Distance	Price	Opens	Closes
13.1 Miles	$85.00	Oct 16	Mar 22
15K	$70.00	Oct 16	Mar 22
3.1 Miles	$40.00	Oct 16	Mar 22
Virtual Run	$50.00	Oct 16	Mar 22

Parking

2026 Rock CF Rivers Half Marathon, 15K & 5K Parking Info There is NO public parking available at Grosse Ile Middle School. This year, there will also be NO parking available at Grosse Ile High School due to an existing event on race day. Utilize the below parking options and plan ahead for your race day logistics! If you are running the Half Marathon/15K, we HIGHLY suggest you plan to be parked 90mins before your race start time for ample shuttle and pre-race accommodations. If you are runni