Rock CF Rivers Half Marathon
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Rock CF Rivers Half Marathon & 5K
The Rock CF Rivers event takes place on Grosse Ile, Michigan on March 21, 2027. It offers in-person and virtual distances around the island and supports the Rock CF Foundation; all race proceeds fund the foundation's programs.
Distances offered:
- Half Marathon
- 15K
- 5K Run/Walk
- Virtual Run/Walk
The half marathon course is USATF certified and described as a fast, flat loop around Grosse Ile. The half marathon is capped at 800 participants, the 15K at 300, and the 5K at 500. The half marathon has a 3 hour 30 minute time limit (about a 16 minute per mile pace); participants beyond that time receive no race support.
Packet pickup is available in advance at Run Detroit (mid-March dates) and at a race expo at Grosse Ile High School the day before the race; race-day pickup locations include the high school gym and the Pilot House for the 5K. Gear check is provided with labeled bags; label colors are Red for the half, Purple for the 15K, and Blue for the 5K.
On-course support includes multiple water stations with Lemon Lime Gatorade and gel options (GU) at specified miles, and port-a-johns at water stations and key locations. Strollers and pets are not permitted. Headphones are allowed. Award categories include top overall placements by gender and nonbinary, masters awards, and age-group awards. Visit the organization's website for the most recent information.
