Lean Horse Ultra

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.