Rock CF Rivers Half Marathon
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Event overview
The 15th Annual Rock CF Rivers races take place on Grosse Ile, Michigan on March 22, 2026. The event offers four options: a half marathon, a 15K, a 5K run/walk, and a virtual run. All proceeds support the Rock CF Foundation; the event page states that 100% of proceeds go to that foundation. A race expo is scheduled the day before the main event at Grosse Ile High School.
Race details
Distances and listed entry fees:
- Half marathon - $85
- 15K - $70
- 5K run/walk - $40
- Virtual run - $50
Race capacity limits are provided for 2026: half marathon cap 800, 15K cap 300, 5K cap 500. Start and finish locations include Grosse Ile High School for the half marathon and finish lines, and the Grosse Ile Airport / Naval Hangar area for the 5K start and the 15K finish. Shuttles will operate between the high school and township parking lots on race day. Virtual participants will receive mailed packets the week of the race so they can complete their chosen distance remotely. Information such as maps, packet pickup, parking, and volunteer opportunities are listed on the event pages. Visit the organization's website for the most recent information.