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Thumb Coast Ultra & Relay

50 Mile, 50K, & 50 Mile Relay on Saturday, April 20, 2024

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Thumb Coast Ultra & Relay

Finish in Caseville, Michigan! 50 Mile starts in Harbor Beach and 55K starts in Caseville.

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Race the Sunset in Caseville, Michigan!

The Thumb Coast is a hidden gem in Michigan. Come try this unique inaugural race to run from "sunrise to sunset" from "one coast to another" on Saturday, April 20, 2024. 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. With only 500ft elevation gain for the 50 Mile and 300ft of elevation gain on the out-and-back 50K (50K starts & finishes in Caseville), this event is FAST and 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 those who "beat the sun" at Thumb Coast Ultra & Relay.

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2024 Thumb Coast Ultra & Relay Registration Cap

Due to overwhelming support (in the best way possible) of the inaugural Thumb Coast Ultra & Relay, we are placing the following caps leading into 2024’s race weekend:


  • 50 Milers capped at 325 registrants
  • 50K capped at 200 registrants 
  • Relay is now closed (unless you have a team created and need to add it; email


Thank you to Caseville, Harbor Beach, Thumb Coast towns, ultra & relay participants, and volunteers for all of the support! Our team is working hard behind the scenes to bring you an unforgettable inaugural race weekend along Michigan’s Thumb Coast. 

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

View Volunteer Opportunities

Thumb Coast Ultra 50 Mile

$150 6:28AM EDT - 9:30PM EDT
55 spots left. Registration ends April 16, 2024 at 11:59pm EDT

Thumb Coast Ultra 50 Kilometer

$130 8:30AM EDT - 9:30PM EDT
47 spots left. Registration ends April 16, 2024 at 11:59pm EDT

50 Mile Relay

$105 6:28AM EDT - 9:30PM EDT
Sorry! This event is full. Registration ends April 16, 2024 at 11:59pm EDT

Virtual 50 Mile

$50 Registration ends April 16, 2024 at 11:59pm EDT

Virtual 50K

$50 Registration ends April 16, 2024 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 2024 and beyond. 

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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
  • 2024 Finisher Medal
  • Race photography
  • Post race food and drinks
View Race Swag

Race Weekend Schedule

Friday, April 19, 2024: Early Packet Pickup

  • Thumb Brewery from 4-7pm
  • Address: 6758 Pine Street
    Caseville, MI 48725


Saturday, April 20, 2024: Race Day

  • 50 Mile Ultra & Relay Start: 6:28 AM in Harbor Beach, MI (Sunrise)
  • 50K Start: 8:30 AM in Caseville, MI
  • Special award 50 Mile Cutoff: 8:24 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 Inaugural Thumb Coast Ultra & Relay!

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