Thumb Coast Ultra & Relay - 50 Mile, 50K, & 50 Mile Relay

Embark on an unforgettable journey across Michigan's scenic Thumb region at the Thumb Coast Ultra & Relay on April 25, 2026, in Caseville, MI. This unique event offers a challenging yet accessible experience with 50-Mile and 50K distances, plus a 50-Mile Relay, making it ideal for both seasoned ultrarunners chasing a personal best and those tackling their first ultra. The race provides a rare opportunity to run point-to-point from the shores of Lake Huron in Harbor Beach to Saginaw Bay in Caseville for the 50-mile course, challenging participants to "beat the sun" by finishing before sunset.

The 50-mile course begins at sunrise in Harbor Beach and travels primarily over approximately 85% dirt roads, 10% paved roads, and 5% unimproved park roads, offering a gorgeous and fast route with minimal elevation gain of around 500 feet. The 50K race is an out-and-back course starting and finishing on the beach at Caseville County Park, traversing mostly unimproved and gravel roads with an equally fast and fun profile boasting about 220-300 feet of elevation gain. Both routes showcase open farmland and picturesque lakeshore views, providing a refreshing spring adventure. Typical race day conditions in late April see highs around 59°F and lows around 35°F, with a 15% chance of precipitation.

Runners can expect a well-supported experience, with fully stocked aid stations every few miles providing water, Tailwind (Mandarin or Raspberry flavors), gels, and real food. This is a cupless race, with reusable cups provided to all athletes. The courses are meticulously marked, ensuring a smooth navigation. The Thumb Coast Ultra & Relay promises a rewarding challenge and a chance to experience the "undiscovered jewel" of Michigan's Thumb.