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Race Overview
The Thumb Coast Marathon is a point-to-point race along Lake Huron's Saginaw Bay shoreline in Michigan's Thumb region, starting in downtown Caseville and finishing on Main Street in Port Austin. The USATF-certified course is flat and fully paved, gaining about 265 feet over 26.2 miles and passing Point Crescent State Park near the finish. It is a Boston Qualifier: 8.9% of finishers in the 2025 inaugural race hit a BQ time, and the course carries a 99.45 course score, the second-fastest marathon course in Michigan. Race weekend also includes a half marathon starting at Sleeper State Park and a 5K in downtown Port Austin.
WikipediaFAQ
When is the 2026 Thumb Coast Marathon?
The 2026 Thumb Coast Marathon will be held on Sunday November 8, 2026.
Is the Thumb Coast Marathon a Boston Marathon Qualfier?
Yes, the Thumb Coast Marathon is an official Boston Marathon qualifier.
What is the time limit for the Thumb Coast Marathon?
The time limit for the Thumb Coast Marathon is 6 hours.
Thumb Coast Marathon Weather History
Thumb Coast Marathon Weather Averages
Average Temp: 45°, Average Low: 36°, Average High: 54°
| Time | 7AM | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM |
|---|---|---|---|---|---|---|---|
| Temp | 39° | 39° | 42° | 46° | 49° | 51° | 53° |
| Feel | 35° | 35° | 39° | 42° | 44° | 51° | 53° |
| Rain | - | - | - | - | - | - | - |
| Wind | 4mph | 5mph | 5mph | 9mph | 13mph | 11mph | 11mph |
| Dew | 34° | 35° | 36° | 39° | 38° | 35° | 34° |
| RunScore |  | | | |  | | |
Thumb Coast Marathon 2025
Nov 2, 2025
Clear conditions throughout the day.
Low: 36°, High: 54°
| Time | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM |
|---|---|---|---|---|---|---|---|
| Temp | 39° | 42° |  46° | 49° | 51° | 53° | 53° |
| Feel | 35° | 39° | 42° | 44° | 51° | 53° | 53° |
| Rain | - | - | - | - | - | - | - |
| Wind | 5mph | 5mph | 9mph | 13mph | 11mph | 11mph | 6mph |
| Dew | 35° | 36° | 39° | 38° | 35° | 34° | 34° |
| RunScore | | | | | | |  |