16TH Annual
16th Annual Rock CF Rivers Half Marathon
16th Annual Rock CF Rivers Half Marathon is a running race on March 21, 2027 in Grosse Ile, MI, with entry fees from $40 to $85.
- Date
- March 21, 2027 (186 days to go)
- Location
- 7800 Grays Dr, Grosse Ile, MI
- Price
- $40–$85
- Sport
- Running
From the Organizer
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.
Events
Typical Conditions
It's too far out for a forecast, so here's what weather on this date is normally like in the area. A race day forecast will replace this as race week approaches.
Typical High
48°
Typical Low
30°
Chance of Rain
37%
Based on US Climate Normals data from Detroit Metro Ap, 12 mi from the venue.
About Grosse Ile, MI
City Elevation
594 ft
Nearest Airport
DTW
Detroit Metropolitan Wayne County Airport · 11 mi
Time Zone
Eastern Time
From Endurance Grid
Line up lodging and travel early to lock in your race weekend.
Race Location
What Are You
Waiting For?
Every finish line starts with a single decision. Claim your spot at 16th Annual Rock CF Rivers Half Marathon, put it on the calendar, and turn “someday” into a start date.
186
Days to train
- Race
- 16th Annual Rock CF Rivers Half Marathon
- Date
- March 21, 2027
- Location
- 7800 Grays Dr, Grosse Ile, MI
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About This Sport
Endurance Grid is here to help you understand the sport, decide if it’s the right fit, and learn how to prepare. For course distances, logistics, and race-day specifics, always defer to the race organizer’s event page.
With running, there's a distance for every fitness level, a community at every start line, and nothing beats the feeling of crossing a finish line you trained for.
Running is an endurance sport that rewards consistency, and showing up every week compounds in ways that will surprise you.
Running
From 5K to marathon, running races are an accessible entry point into endurance sport. There's a distance for every fitness level and a community at every start line.
More Running races near Grosse Ile, MI
Frequently Asked Questions
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16th Annual Rock CF Rivers Half Marathon
Mar 21, 2027