In 183 days · Sun, Mar 21, 2027
Don't let race day sneak up
One email during race week. That's it.
When
Sunday, March 21st, 2027
Where
7800 Grays Dr, Grosse Ile MI
Distances
Half · 15K · 5K
Typical weather
32–47°F · some rain risk
See last 10 years
On this date: rain 0 of the last 10 years
2026
30–41°F
dry
2025
29–51°F
dry
2024
22–33°F
dry
2023
35–47°F
dry
2022
35–54°F
dry
2021
30–50°F
dry
2020
26–34°F
dry
2019
35–48°F
dry
2018
29–39°F
dry
2017
30–55°F
dry
Best months to race in Michigan →
About this race
Race Overview
- Event: 16th Annual Rock CF Rivers Half Marathon, 15K, and 5K
- Date: March 21st, 2027
- Location: 7800 Grays Dr, Grosse Ile, MI
- Website: Visit the race page
Event Highlights
- Community Support: Join us to help outrun cystic fibrosis!
- Starting Point: Race starts at Grosse Ile High School.
- Course: A flat-and-fast course perfect for personal bests.
- Scenic Views: Experience views of the Detroit River.
Who Can Participate
- All Runners: Suitable for everyone from beginners to experienced runners.
- Family Friendly: Bring friends and family to enjoy the race together.
- Multiple Distances: Choose from a half marathon, 15K, or 5K.
- Premier Race: One of Michigan's premier spring races!
Course map
Hotels for race weekend
Live prices near the start line, Mar 20 – 22, 2027.
Train with a club
Run clubs near Grosse Ile to train with before race day.
See all run clubs near Grosse Ile →
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