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

Race Overview

Thumb Coast Ultra &: Relay is a one-of-a-kind spring ultramarathon in Michigan’s Thumb. On Saturday, April 25, 2026, 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.

Course Details

• Point-to-point course: A unique route from Harbor Beach to Caseville in the 50 Mile and Relay.
• Elevation gain: Only 500 feet in the 50 Mile and 300 feet in the 50K.
• Accessibility: Approachable for first-time ultrarunners and fast for seasoned athletes.
• Cutoff times: Generous times allow all participants a chance to achieve their goals.

Participant Experience

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.

Why Run Thumb Coast Ultra?

• Unique experience: Participate in the only point-to-point ultramarathon in the area.
• Flat and fast: Perfect for speed seekers with minimal elevation gain.
• Relay option: Gather your crew and tackle the 50 Mile as a team.
• Ruck divisions: Available in both the 50 Mile and 50K for added challenge.
• Support for all: Generous cutoff times for beginners and seasoned veterans alike.
• Special prizes: Unique rewards for 50 Milers who beat the sunset at the finish.
• Community involvement: Well-marked courses and enthusiastic volunteers to ensure a great experience.
• Spring race: Enjoy a true spring race experience in Michigan’s Thumb before the summer rush.

For more information, visit the event page at Thumb Coast Ultra & Relay.