The 16th Annual Rock CF Rivers Half Marathon, 15K, and 5K is coming back to the island of Grosse Ile, Michigan on Sunday, March 21st, 2027 for all to come and help us outrun cystic fibrosis! Starting from the Grosse Ile High School, enjoy the flat-and-fast course en route to chasing a personal best, experiencing your first half marathon, or taking in the scenic views of the Detroit River with friends & family at one of Michigan's premier spring races.
This is more than a race.
This race directly affects the amount of shoes, trade school scholarships, mental wellness programs, awareness campaigns, and resources that we are able to provide the cystic fibrosis community.
Your experience at the Rivers Half Marathon goes beyond race day. By supporting this race, you support the mission of the Rock CF Foundation.
Half Marathon
Price:
$90
Time:
8:00AM EDT
- 11:30AM EDT
Registration ends March 21, 2027 at 7:45am EDT
5K Run/Walk
Price:
$40
Time:
8:15AM EDT
- 11:30AM EDT
Registration ends March 21, 2027 at 8:00am EDT
Race Details
Saturday, March 20th
Race Expo & Packet Pickup
Grosse Ile High School
12:00 PM - 6:00 PM
Sunday, March 21st
Half Marathon & 15K - 8:00 AM
Grosse Ile High School
5K Run/Walk - 8:15 AM
Grosse Ile Naval Hangar
