Thumb Coast Marathon
Thumb Coast Marathon race day weather
Cool start, warming finish
Runners will face a cool start at 41°F, warming to 49°F by the finish. Wind will be a factor, starting with a crosswind in Mile 1, shifting to a headwind in Mile 2, and transitioning to tailwinds from Miles 3 through 17, before returning to headwinds in Mile 20. With high humidity at 82%, runners should consider adjusting their pace early and hydrate frequently.
The finish is 16 miles from the start, so we forecast it at 2 points, not just the start line. At 9:00/mi, you start at 41° and finish around 11:55 AM in 49°.
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Thumb Coast Marathon route and elevation
The Thumb Coast Marathon course has about 102 ft (31 m) of climbing and 118 ft (36 m) of descent, a net drop of about 16 ft (5 m). It is flatter than 82% of the marathon courses racecast.io has mapped, measured by what the hills cost in time. It has no steep miles: no mile climbs more than 25 ft (8 m).
What the hills cost
The hills change finish times by less than 0.2% here, under half a minute for a 4:00 runner.
Hills only, priced mile by mile on the course map. The pace calculator above adds the race-day weather.
Even-effort splits for a 3:30, 4:00 or 4:30 finish
| Mile | Climb | Descent | 3:30 | 4:00 | 4:30 |
|---|---|---|---|---|---|
| 1 | 6 ft | 5 ft | 8:00 | 9:08 | 10:17 |
| 2 | 13 ft | 9 ft | 8:02 | 9:11 | 10:19 |
| 3 | 8 ft | 8 ft | 7:59 | 9:08 | 10:17 |
| 4 | 4 ft | 7 ft | 8:00 | 9:08 | 10:16 |
| 5 | 11 ft | 20 ft | 7:57 | 9:06 | 10:14 |
| 6 | 6 ft | 7 ft | 8:00 | 9:08 | 10:17 |
| 7 | 9 ft | 5 ft | 8:02 | 9:11 | 10:20 |
| 8 | 13 ft | 10 ft | 8:01 | 9:10 | 10:18 |
| 9 | 10 ft | 10 ft | 8:00 | 9:08 | 10:17 |
| 10 | 11 ft | 16 ft | 7:58 | 9:07 | 10:16 |
| 11 | 12 ft | 5 ft | 8:03 | 9:12 | 10:20 |
| 12 | 12 ft | 4 ft | 8:04 | 9:13 | 10:22 |
| 13 | 2 ft | 12 ft | 7:57 | 9:05 | 10:14 |
| 14 | 12 ft | 9 ft | 8:02 | 9:11 | 10:20 |
| 15 | 2 ft | 7 ft | 7:59 | 9:07 | 10:15 |
| 16 | 4 ft | 10 ft | 7:58 | 9:07 | 10:15 |
| 17 | 15 ft | 10 ft | 8:03 | 9:11 | 10:20 |
| 18 | 6 ft | 4 ft | 8:01 | 9:10 | 10:19 |
| 19 | 7 ft | 18 ft | 7:57 | 9:05 | 10:14 |
| 20 | 15 ft | 6 ft | 8:04 | 9:14 | 10:22 |
| 21 | 12 ft | 6 ft | 8:03 | 9:12 | 10:21 |
| 22 | 6 ft | 9 ft | 7:59 | 9:07 | 10:16 |
| 23 | 9 ft | 6 ft | 8:01 | 9:10 | 10:18 |
| 24 | 7 ft | 8 ft | 8:00 | 9:08 | 10:17 |
| 25 | 24 ft | 9 ft | 8:07 | 9:17 | 10:26 |
| 26 | 10 ft | 30 ft | 7:55 | 9:03 | 10:11 |
| Last 0.2 | 2 ft | 0 ft | 1:48 | 2:03 | 2:19 |
Explore the Thumb Coast Marathon course with the weather and your pace along the route, or compare it with other races.
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About the Thumb Coast Marathon
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. Source