Thumb Coast Ultra

Event overview

The Thumb Coast Ultra & Relay takes place on Saturday, April 25, 2026, in Michigan’s Thumb region. The event features multiple divisions:

• 50 Mile - point-to-point from Harbor Beach (Lake Huron) to Caseville (Saginaw Bay)
• 50 Kilometer (50K) - out-and-back starting and finishing at Caseville County Park
• 50 Mile Relay - teams cover the 50 Mile route
• 50 Mile Ruck and 50K Ruck
• Virtual 50 Mile and Virtual 50K
• Pacer role available

Place information lists Caseville, MI 48725 as the race location and Harbor Beach as the 50 Mile start.

Course details and race features

The 50 Mile course is mostly rural roads: about 85% dirt, 10% paved, and 5% unimproved park roads, with roughly 500 feet of elevation gain. The 50K uses mostly unimproved and gravel roads. Courses are described as well marked with fully stocked aid stations. Aid stations will include water, Tailwind, gels, and real food.

Registration benefits and on-course services include a custom jacket, bumper sticker, reusable silicone race cup, 2026 finisher medal, race photography, and post-race food and drinks. The event notes generous cutoff times and a special prize for 50 Mile finishers who complete the route in daylight. Packet pickup is scheduled the day before at Thumb Brewery in Caseville. Visit the organization's website for the most recent information.