The Rock CF Thumb Coast Marathon, Half Marathon & 5K
Always double-check with the organizer's website! This page may contain affiliate links.
The Rock CF Thumb Coast Marathon, Half Marathon and 5K
The Rock CF Thumb Coast Marathon, Half Marathon and 5K are co-produced by the Rock CF Foundation and Trivium Racing and take place on Sunday, November 8, 2026, along Michigan's Thumb Coast between Caseville and Port Austin. The event uses public roadways and is centered on Port Austin, MI.
The courses are fully paved and USATF certified. The organizers describe the routes as flat and fast with extended views of Lake Huron. Distances offered are:
- Marathon: Point-to-point from downtown Caseville to downtown Port Austin
- Half Marathon: From Sleeper State Park to Port Austin
- 5K: Scenic loop around downtown Port Austin
The published event address is 8774 Lake St., Port Austin, MI 48467. In the event of cancellation for reasons beyond the control of the Race Director or Race Committee, refunds will not be issued; race packets, including race shirts, will be made available at a location to be determined. The refund policy states no refunds within 30 days of the event; requests earlier than 30 days may be considered for a 50% refund of the entry fee excluding processing fees. Entries cannot be deferred to another year or event. Entries may be transferred to another individual for a $5 transfer fee, and T-shirt size changes are not permitted. Visit the organization's website for the most recent information.
