Where do the different races start?

The Marathon starts in Caseville, the Half Marathon starts in Sleeper State Park, and the 5K starts in downtown Port Austin.

Are there pace teams available?

Yes, Beast Pacing will provide pace teams for both the Marathon and Half Marathon distances.

What is the cause supported by this race?

Every registration supports the Rock CF Foundation, a nonprofit dedicated to improving the lives of individuals living with cystic fibrosis.

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4 weeks out

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All races

4 weeks out

Rock CF Thumb Coast Marathon, Half Marathon & 5K

Sunday, November 8, 2026Port Austin, MI5K – Marathon

The Rock CF Thumb Coast Marathon, Half Marathon, and 5K offers a fast, flat, and fully paved experience across Michigan’s scenic Thumb region. This point-to-point course is USATF-certified and serves as a Boston Qualifier, making it an ideal choice for runners chasing a personal best. Participants will enjoy crisp November weather and stunning views along the shores of Lake Huron. Beyond the race, the event fosters a strong sense of community by supporting the Rock CF Foundation’s mission to improve the lives of those with cystic fibrosis. Whether you are a seasoned marathoner or a 5K participant, you will experience small-town charm and a lively finish line atmosphere in downtown Port Austin.