Race the Sunset in Caseville, Michigan!

The Thumb Coast is a hidden gem in Michigan. Don’t miss the 2nd Annual Thumb Coast Ultra & Relay for a unique experience to run from "sunrise to sunset" from "one coast to another" on Saturday, April 26, 2025. 50 Milers race from Harbor Beach's Lake Huron to Lake Huron's Saginaw Bay in Caseville! Can you make it to the finish line before sunset?

This amazing route follows mostly dirt roads through the thumb. 50 Milers and relay teams start in Harbor Beach and the 50K starts & finishes in Caseville. This event is perfect for beginners, seasoned vets, and those looking for a personal best. The course will be extremely well marked with great aid stations along the way! We have generous cutoff times, and additional prizes for 50 Mile ultra finishers who "beat the sun" at Thumb Coast Ultra & Relay.

Join our team of volunteers…

Are you not ready to run with us in April 2025 but feeling a strong desire to experience the 2nd Annual Thumb Coast Ultra & Relay? Click the button below to join our awesome team of volunteers…

 The thumb is a great place to visit with a lot of amazing places to stay, great restaurants, and plenty for family and friends to do! Thumb Coast Ultra & Relay will be a must do event in 2025 and beyond. Thank you to Caseville, Harbor Beach, Thumb Coast towns, ultra & relay participants, and volunteers for supporting another year of racing along Michigan’s Thumb Coast. 

What's Included in Registration?

Thumb Coast Ultra & Relay Registration Includes:

• Custom Thumb Coast Ultra Jacket
• Thumb Coast Ultra Bumper Sticker
• Reusable Race Cup
• 2025 Finisher Medal
• Race photography
• Post race food and drinks

Race Weekend Schedule

Friday, April 25, 2025: Early Packet Pickup

• TBA

Saturday, April 26, 2025: Race Day

• 50 Mile Ultra & Relay Start: 6:29 AM in Harbor Beach, MI (Sunrise)
• 50K Start: 8:30 AM in Caseville, MI
• Special award 50 Mile Cutoff: 8:31 PM Caseville, MI (Sunset)
• 50 Mile and 50 Kilometer Cutoff: 9:30 PM

50 Mile & 50 Mile Relay Course

The 50 Mile course is a point-to-point course which starts at sunrise in Harbor Beach, Michigan and finishes in Caseville, Michigan. Click the button below to learn more and to view the course map!

50K Course

The 50K course is an out-and-back course which starts and finishes in Caseville, Michigan. Learn more about the course and view the course map by clicking the button below.

Start & Finish Line Locations

Click the links below for a Google map location for the start/finish lines…

Start Line for 50 Mile: Harbor Beach

Start/Finish Line for 50K (and 50 Mile Finish): Caseville County Park