Thumb Coast Ultra & Relay is a one-of-a-kind spring ultramarathon in Michigan’s Thumb. On Saturday, April 24, 2027, runners and ruckers will take on the challenge of racing from Lake Huron in Harbor Beach to Saginaw Bay in Caseville in the 50 Mile division—or team up with friends for the 50 Mile Relay. The 50K features a flat out-and-back course starting and finishing in Caseville.
This race offers the rare opportunity to run point-to-point across the Thumb on mostly dirt and unimproved rural roads. With just 500 feet of elevation gain in the 50 Mile and 300 feet in the 50K, it’s a course that is both approachable for first-time ultrarunners and fast enough for seasoned athletes looking to chase a personal best. Generous cutoff times allow all participants a chance to achieve their goal, while 50 Mile finishers who “beat the sun” with a daylight finish earn a unique prize in addition to their medal.
Thumb Coast Ultra & Relay is more than just a race—it’s a test of endurance, teamwork, and determination supported by a welcoming community. Participants can expect a well-marked course, fully stocked aid stations, and the camaraderie of runners, ruckers, and relay crews tackling the same adventure together.
Apr 24, 2027
Distance — 50 Miles
Type — Running
00:00
$55.00
Apr 24, 2027
Distance — 50K
Type — Running
00:00
$55.00
Apr 24, 2027
Distance — 50 Miles
Type — Running
05:00
$150.00
Apr 24, 2027
Distance — 50 Miles
Type — Running
06:27
$90.00
Apr 24, 2027
Distance — Pacer
Type — Running
06:27
$10.00
Apr 24, 2027
Distance — 50 Miles
Type — Running
06:27
$150.00
Apr 24, 2027
Distance — 50K
Type — Running
07:30
$125.00
Apr 24, 2027
Distance — 50K
Type — Running
08:30
$125.00
These values represent the 3-year monthly averages for April in Caseville.
Learn more about the host city, Caseville.
Caseville is a city in Huron County in the U.S. state of Michigan, located at the mouth of the Pigeon River on Saginaw Bay of Lake Huron. The population was 652 at the 2020 census. The city is surrounded by Caseville Township. A popular destination for summer tourists, it sponsors the 10-day Cheeseburger in Caseville festival, a tribute to Jimmy Buffett's song "Cheeseburger in Paradise". It has been also called the "Perch Capital of Michigan" for its extraordinary catches of the native fish yellow "perch".
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