The Lean Horse Ultra Marathon is run in August every year in the Black Hills of South Dakota. It was first run in 2005. It features a 100-mile race, a 50-mile race, a 30-mile race, and a 20-mile race. The course is held on the George S. Mickelson Trail.
Fun Facts:
- 33rd sanctioned 100-mile race in the United States
- known as one of the best non technical courses in the United States.
- One of the most scenic rails to trails courses in the country
