Thumb Coast Ultra and Relay

Embark on an unforgettable journey across Michigan's scenic Thumb region with the Thumb Coast Ultra and Relay, taking place on April 25, 2026, in Caseville, MI. This distinctive event offers ultrarunners the rare opportunity to race point-to-point across the Thumb, from the shores of Lake Huron in Harbor Beach to Saginaw Bay in Caseville, covering distances of 50 miles or 50 kilometers. Whether you're an experienced ultrarunner seeking a personal best or a first-timer ready for a significant challenge, this race is designed to deliver a memorable experience.

The 50-mile course is predominantly flat and fast, featuring approximately 85% dirt roads, 10% paved, and 5% unimproved park roads, with a minimal elevation gain of roughly 500 feet. Runners will traverse quiet rural roads, enjoying expansive dirt roads, open farmland, and picturesque lakeshore views. The 50K event, an out-and-back course starting and finishing at Caseville County Park, also promises a fast experience on mostly unimproved and gravel roads with around 220-300 feet of elevation gain. Both courses are exceptionally well-marked and supported by fully stocked aid stations approximately every five miles, offering water, Tailwind, gels, and a variety of real food options like fruit, pretzels, chips, and even bacon. Typical race day conditions in late April see comfortable highs around 59F and lows near 35F, with a modest 15% chance of precipitation, though layers are recommended due to potential weather exposure.

What truly sets the Thumb Coast Ultra apart is its compelling "Beat the Sun" challenge, offering a special prize for 50-mile finishers who cross the finish line in daylight. With generous cutoff times and a supportive race atmosphere, this event is ideal for those looking to push their limits on a relatively flat course or tackle their inaugural ultra. The race culminates with a post-race celebration at Caseville County Park, complete with a cook-to-order breakfast for participants.