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Thumb Coast Ultra & Relay

50 Mile, 50K, & 50 Mile Relay on Saturday, April 26, 2025

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Thumb Coast Ultra & Relay

Finish in Caseville, Michigan! 50 Mile starts in Harbor Beach and 50K starts in Caseville.

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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.

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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…

View Volunteer Opportunities

Thumb Coast Ultra 50 Mile

$120 6:29AM EDT - 9:30PM EDT Price increases after August 31, 2024 at 11:59pm EDT

Thumb Coast Ultra 50 Kilometer

$100 8:30AM EDT - 9:30PM EDT Price increases after August 31, 2024 at 11:59pm EDT

50 Mile Relay

$75 6:29AM EDT - 9:30PM EDT Price increases after August 31, 2024 at 11:59pm EDT

50 Mile Ruck

$120 5:00AM EDT - 9:30PM EDT Price increases after August 31, 2024 at 11:59pm EDT

50K Ruck

$100 7:30AM EDT - 9:30PM EDT Price increases after August 31, 2024 at 11:59pm EDT

Virtual 50 Mile

$50 Registration ends April 25, 2025 at 11:59pm EDT

Virtual 50K

$50 Registration ends April 25, 2025 at 11:59pm EDT

 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. 

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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
View Race Swag

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

 

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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!

View More 50 Mile Course Details

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.

View More 50K Course Details

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

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Countdown to the 2nd Annual Thumb Coast Ultra & Relay!

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