Rock CF Thumb Coast Marathon, Half Marathon & 5K

The Rock CF Thumb Coast Marathon, Half Marathon & 5K is back on Sunday, November 8, 2026. This second year event offers a flat, fast, fully paved, USATF-certified course stretching across Michigan’s beautiful Lake Huron coastline. The Marathon is a Boston Qualifier, and both the Marathon and Half will include pace teams to help you hit your goals. Starting in Caseville and finishing in downtown Port Austin, this point-to-point race delivers the perfect combination of speed, scenery, and small-town charm. Whether you’re chasing a PR, running your first race, or planning a fall race-cation, the Rock CF Thumb Coast Marathon has it all.

Become a Fundraiser

This is more than a race.

Your experience at the Rock CF Thumb Coast Marathon goes beyond the miles. Every step helps fund the Rock CF Foundation, a Michigan nonprofit dedicated to supporting individuals living with cystic fibrosis through awareness, advocacy, and action.

By racing with us, you’re not only pushing your own limits—you’re helping power life-changing programs.

Race Details

Date:

Sunday, November 8, 2026

Distances:

Marathon - 8:00 AM

Half Marathon - 8:30 AM

5K - 9:00 AM

Locations:

Marathon starts in Caseville, Half Marathon in Sleeper State Park, 5K in downtown Port Austin—all finishing in Port Austin, Michigan

Course:

The Marathon course is fully paved, flat, USATF-certified; Marathon is a Boston Qualifier