The Rock CF Thumb Coast Marathon

The Rock CF Thumb Coast Marathon, Half Marathon, and 5K is set to take place on November 2, 2025, along Michigan's scenic Thumb Coast. Organized by the Rock CF Foundation and Trivium Racing, this event features a flat, fast course with breathtaking views of Lake Huron. The marathon starts in downtown Caseville and finishes in Port Austin, while the half marathon begins at Sleeper State Park.

The 5K is a loop around downtown Port Austin. Proceeds from the event support the Rock CF Foundation's mission to assist those living with cystic fibrosis, making every mile meaningful for participants. Visit the organization's website for the most recent information.