The Rock CF Thumb Coast Marathon, Half Marathon and 5K

The Rock CF Foundation and Trivium Racing are excited to bring to life the Thumb Coast Marathon: a flat, fast course featuring stunning views of Lake Huron. Starting in historic downtown Caseville, this point-to-point course will travel east with a downtown finish in beautiful Port Austin.

Your experience at this coastal marathon goes beyond just your own personal goals, as proceeds from this event go directly towards the Rock CF Foundation’s mission to support those living with cystic fibrosis around the country.

The Full Marathon will start in Caseville and finish in Port Austin, whereas the Half Marathon will start in Sleeper State Park and finish at the same location in Port Austin. The 5K will be a loop around downtown Port Austin, featuring the same finish line as the Full and Half. Detailed maps of all courses will be posted soon.