The Rock CF Thumb Coast Marathon
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The Rock CF Thumb Coast Marathon, Half Marathon, and 5K
The Rock CF Thumb Coast Marathon, Half Marathon, and 5K take place on Sunday, November 8, 2026, between Caseville and Port Austin, Michigan. The event is co-produced by the Rock CF Foundation and Trivium Racing. A Port Austin mailing address is listed as 8774 Lake St., Port Austin, MI 48467.
The courses are described as fully paved and USATF certified, with sweeping views of Lake Huron. The organizer describes the routes as flat and fast. The marathon is a point-to-point route from downtown Caseville to downtown Port Austin. The half marathon starts at Sleeper State Park and finishes in Port Austin. The 5K is a scenic loop around downtown Port Austin.
Distances:
- Marathon: Point-to-point from downtown Caseville to downtown Port Austin
- Half Marathon: Sleeper State Park to Port Austin
- 5K: Scenic loop around downtown Port Austin
The event policies state that if the race is canceled for reasons beyond the control of the race director or committee, refunds will not be made but race packets and shirts will be available at a location to be determined. Refunds are not issued within 30 days of the event; earlier requests may be eligible for a 50 percent refund excluding processing fees. Entries may be transferred to another individual for a $5 fee. The event is included in Trivium Racing series options that offer series awards for completing multiple events. Visit the organization's website for the most recent information.
