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Choose between a 50K, 50 mile or 50 mile relay. Run sun up to sun down beginning in Harbor Beach and ending in Caseville.
Volunteer Registration "Volunteers are essential to the success of Thumb Coast Ultra & Relay on Saturday, April 25, 2026, supporting runners, ruckers, and relay teams across a flat, rural course that spans Harbor Beach to Caseville. Community members, groups, and organizations are invited to help with packet pickup, start and finish lines, aid stations, and relay exchanges—no running required."