The Rock CF Thumb Coast Marathon
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Event
The Rock CF Thumb Coast Marathon, Half Marathon, and 5K is scheduled for Sunday, November 2, 2025 in Port Austin, Michigan. The event is organized by the Rock CF Foundation and Trivium Racing. Proceeds support the Rock CF Foundation’s work for people living with cystic fibrosis. The course area is on Michigan’s Thumb Coast and the race uses fully paved roads. The marathon course is USATF-certified and listed as a Boston Qualifier.
Race details
The event includes point-to-point and loop formats. The full marathon starts in downtown Caseville and finishes in downtown Port Austin. The half marathon starts at Sleeper State Park and finishes in Port Austin. The 5K is a loop around downtown Port Austin and shares the same finish area as the marathon and half. Pace teams from Beast Pacing will be available for the marathon and half. Detailed course maps are available for the marathon and half marathon. Distances and formats: Visit the organization's website for the most recent information.
- Marathon - point-to-point, Caseville to Port Austin
- Half Marathon - point-to-point, Sleeper State Park to Port Austin
- 5K - loop around downtown Port Austin
- Virtual races and economy registration options are offered for multiple distances