Race Discovery
Rock CF Rivers Half Marathon & 5K
Rock CF Rivers Half Marathon & 5K logo

Rock CF Rivers Half Marathon & 5K

Grosse Ile, Michigan, United States View on map
Mar 21, 2027 (America/Detroit local time)
Running

About this race

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!

Pick your distance

Running

Half Marathon

The Half Marathon starts & finishes Grosse Ile Middle School.

Mar 21, 2027 Half-Marathon 8:00 AM
$85.00
Open

15K

The 15K will start with the Half Marathon at Grosse Ile Middle School and finish at the GI Airport.

Mar 21, 2027 15K 8:00 AM
$70.00
Open

5K Run/Walk

The 5K starts at the GI Airport and finishes at Grosse Ile Middle School! Participants can gather in hangar before headed to the start line south of the hangar.

Mar 21, 2027 5K 8:15 AM
$40.00
Open

Virtual Run

Mar 21, 2027 Virtual Run 8:00 AM
$50.00
Open

Course

No course map published yet.

The organizer hasn't released a route for this event, and we don't publish guesses. If you're the organizer, send us a GPX file and we'll draw the profile.

Reviews

Done this event?

If you've participated in this event, share your experience with other runners

Other races near Grosse Ile

Different organizers, within 40 miles, in the next three months

🏃 Plan Your Next Race in Grosse Ile

Find upcoming events by distance:

Where this page comes from. Race details were last updated on . We re-check listings regularly and again in the week before race day.

  • Entries, prices, waves and inclusions — the event's official registration page
  • Temperature and humidity — Copernicus ERA5 reanalysis via Open-Meteo (CC BY 4.0)
  • Elevation and terrain relief — Copernicus DEM GLO-90, ESA (CC BY 4.0)
  • Comparisons and counts — Race Discovery calendar, 2 Grosse Ile events

Spotted something wrong? Tell us and we'll fix it.