The Rock CF Thumb Coast Marathon

The Rock CF Thumb Coast Marathon, Half Marathon, and 5K take place along Michigan's Thumb Coast, starting in Caseville and finishing in Port Austin. This point-to-point course is fully paved, flat, and fast, offering sweeping Lake Huron views. The Full Marathon runs Caseville to Port Austin, the Half begins at Sleeper State Park, and the 5K loops through downtown Port Austin to the same finish line.

Co-produced by the Rock CF Foundation and Trivium Racing, the event emphasizes scenery and accessibility for runners of all levels. Proceeds support the cystic fibrosis community; detailed maps and course information are provided on the event site. Visit the organization's website for the most recent information.