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 on November 2nd, 2025. Starting in historic downtown Caseville, Michigan, this point-to-point course will travel east with a downtown finish in beautiful Port Austin, Michigan. 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.

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.

Learn more about the Rock CF Foundation: https://letsrockcf.org/

Start Times:

Marathon: 8:00am

Location: Downtown Caseville, MI

Half Marathon: 8:30am

Location: Sleeper State Park, Caseville, MI

5K Run/Walk: 9:00am

Location: Downtown Port Austin, MI

More information and registration: https://runsignup.com/rockcfthumbcoast