Logo

Lean Horse Ultra

Custer, United States • 15-16 Aug 2025

The Lean Horse Ultra Marathon, held annually in August in Custer, South Dakota, features a variety of race distances including 100 miles, 50 miles, 30 miles, 20 miles, and a unique 30-mile Black Hills CrossFit Edition with options for singles and relay teams. Established in 2005, the event takes place on the scenic George S. Mickelson Trail, known for its gentle climbs and beautiful landscapes.

The race is recognized as one of the best non-technical courses in the U.S. and is the 33rd sanctioned 100-mile race in the country. Participants can expect pleasant August temperatures while enjoying this challenging yet picturesque event. Visit the organization's website for the most recent information.

United States South Dakota Custer

Race information

Website
100 mi
100 Miler
50 mi
50 Miler
30 mi
30m Black Hills Crossfit Edition - Single
30 mi
30 Miler
30 mi
Bhcfe - Team of 3
30 mi
Bhcfe - Team of 6
20 mi
20 Miler
5 Person Relay
Visit the organization's website for the most recent information.
Trail runs nearby

Coon Hollow

Rockerville - 18 mi from Custer

Coon Hollow is an exciting running event taking place at the Coon Hollow Trailhead in Rockerville, SD, on April 26, 2025. The race features a challenging 10k course, which is actually closer to 12k (7.5 miles), incorporating gravel roads, technical dirt single track, and the historic flume trail. Pa..

Skyline Trail Run

Rapid City - 28 mi from Custer

The Skyline Trail Run is a 5k event set in the scenic trails surrounding Dinosaur Park in the Skyline Wilderness Area of Rapid City, South Dakota. Participants can enjoy a vibrant running experience amidst beautiful landscapes. After the race, food and drinks will be provided, along with raffle priz..

Haven Half Marathon, 30k & 10k

Hisega - 22 mi from Custer

The Haven Half Marathon, 30k, and 10k will take place on July 26, 2025, in Hisega, SD, along the scenic Tomaha Trail. This event offers three race options: the challenging 30k covering 20.5 miles with significant elevation gain, the half marathon at 12.37 miles, and a 10k out-and-back course suitabl..