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 are organized by the Rock CF Foundation and Trivium Racing and take place on Sunday November 8, 2026 in the Thumb region of Michigan. The event area links downtown Caseville, Sleeper State Park, and downtown Port Austin, with a listed event location at 8774 Lake St., Port Austin, MI.
Distances offered include:
- 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 courses are fully paved and USATF certified and run along sections of shoreline with views of Lake Huron. The marathon is point to point while the 5K is a local loop.
Administrative rules state that no refunds will be issued within 30 days of the event. Earlier than 30 days a request may be made for a 50 percent refund of the entry fee excluding processing charges. Entries can be transferred to another individual for a five dollar transfer fee; shirt size changes are not available and entries cannot be deferred to another event or year. If the race is canceled for reasons beyond the control of the race committee, race packets including shirts will be made available at a location to be determined. Visit the organization's website for the most recent information.
