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.
Rankings will be listed once the results for this inaugural marathon have been posted.
Its Course Score of 99.45 ranks it as the 113th fastest marathon course in the U.S. and the 2nd fastest course in Michigan.
The typical race time temperature and humidity levels are within the ideal range for optimal marathon performance. This, coupled with the Course Score, gives the Thumb Coast Marathon a PR Score of 99.45. This PR Score ranks it as the 78th fastest marathon in the U.S. and the 1st fastest in Michigan.
Learn more about PR Scores and Course Scores on the FAQ page.
Thumb Coast Marathon Elevation Chart
Max Elevation: 612 feet (186m) Min Elevation: 582 feet (177m)
