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!
Mar 21, 2027
Distance — 15K
Type — Running
08:00
$70.00
Mar 21, 2027
Distance — 21.1K
Type — Running
08:00
$85.00
Mar 21, 2027
Distance — Virtual Run
Type — Running
08:00
$50.00
Mar 21, 2027
Distance — 5K
Type — Running
08:15
$40.00
These values represent the 3-year monthly averages for March in Grosse Ile.
Learn more about the host city, 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.
Read more launchRead what other athletes have to say about their experience at the 15th Annual Rock CF Rivers Half Marathon & 5K.
Be the first to share your experience with the community!
Spotted an error or missing detail about the 15th Annual Rock CF Rivers Half Marathon & 5K? Help us improve.
Explore other exciting events happening in this same region.
location_on Detroit, Michigan, US
calendar_today Sep 26, 2026
location_on New Boston, Michigan, US
calendar_today Oct 04, 2026
location_on Detroit, Michigan, US
calendar_today Sep 26, 2026
Hand-picked events we think you’ll love.
Oct 31, 2026
Whether you’re a seasoned runner or just love to walk and take in the scenery, SKECHERS Wicked Wine Run is for you! Eac…
Read more
Oct 24, 2026
Whether you’re a seasoned runner or just love to walk and take in the scenery, SKECHERS Wicked Wine Run is for you! Eac…
Read more
Sep 26, 2026
ABOUT THE TOUR The Harvest Homecoming Bicycle Tour is one of the most picturesque rides offered to cyclists in Southern…
Read more
