About the 16th Annual Rock CF Rivers Half Marathon
The race loops Grosse Ile, an island on the Detroit River, so the surroundings are water and residential streets rather than a park or trail system. Some distances run point-to-point, with start and finish points spread across the island, including a naval air hangar and the airport area. All proceeds support cystic fibrosis programming, so the cause is woven into the event.
There is no parking at the middle school on race day. Shuttle lots near the airport feed runners to the start, with buses running continuously before and after. Packet pickup happens the week before at a Detroit running store, the day before at the middle school gym, and on race morning at the middle school or the Pilot House, depending on your distance.
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16th Annual Rock CF Rivers Half Marathon 2026 Results
Going by the 2026 results, this is a decent-sized field, with a competitive front end and a big recreational middle.
Half Marathon Results · 2026
672finishers
1:03:19winner
1:57:09median
3:36:06cutoff
Top 3: Andrew Bowman (1:03:19) · John Burchfield (1:06:48) · Nick Licari (1:07:24)
5K Results · 2026
399finishers
17:24winner
35:35median
1:32:29cutoff
Top 3: Tyler Dew (17:24) · Donald Alexander (17:43) · Michael Grinols (17:44)
15K Results · 2026
186finishers
54:18winner
1:36:48median
2:43:08cutoff
Top 3: Adam Maier (54:18) · Sarah Kasabian-Larson (57:37) · Megan Muhs (58:59)
The 16th Annual Rock CF Rivers Half Marathon is in its 16th year.
How we calculate these stats: RunSesh calculates these figures from the most recent published results of past editions, sourced from RunSignup. We show aggregates only: field size, winning and median times, and the cutoff. We never publish individual finisher tables. Last updated Oct 25, 2026.
Distances & Start Times
13.1 Miles3/21/2027 08:00$90
15K3/21/2027 08:00$75
3.1 Miles3/21/2027 08:15$40
Virtual Run3/21/2027 08:00$50
Going for a Time?
Set a goal and get a pace band: every mile split on a card sized for your phone lock screen, so race morning needs no math.
Not sure what to aim for? The half marathon pace chart lists the pace for every finish time.
Where to Stay
Traveling for this race? The map shows hotels and rentals in and around Grosse Ile — pan or zoom to compare what's nearby.
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