8774 Lake St. Port Austin, Port Austin MI
Wednesday, October 1st, 2025
🏃♂️ Event Overview
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.
🎗️ Purpose of the Race
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.
🏁 Race Distances
- Full Marathon: Starts in Caseville and finishes in Port Austin.
- Half Marathon: Starts in Sleeper State Park and finishes in Port Austin.
- 5K: A loop around downtown Port Austin, finishing at the same location as the Full and Half.
- Course Maps: Detailed maps of all courses will be posted soon.
📍 Event Details
Date: 2025-10-01
Location: 8774 Lake St. Port Austin, Port Austin, MI
For more information, visit: Thumb Coast Marathon Registration
Starting Line Map
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