Lean Horse

Set against the breathtaking backdrop of the Black Hills, the Lean Horse offers an unforgettable ultra-running experience on August 1, 2026, in Custer, South Dakota. Runners can choose from challenging 50M, 30M, and 20M distances, plus a unique 30M Black Hills CrossFit Edition. The course primarily follows the George S. Mickelson Trail, a historic railroad bed transformed into a non-technical crushed limestone path. This "rails-to-trails" design provides extended gentle climbs and descents, making it an excellent choice for both seasoned ultra-runners and those tackling their first longer distance. The scenic route winds through forested and mountainous terrain, offering continuous stunning views.

Known since its inception in 2005 for its welcoming "small town" atmosphere and well-organized logistics, the Lean Horse has earned a reputation as one of the best non-technical ultra courses in the United States. Typical race day conditions in early August see comfortable highs around 80°F and lows around 57°F, with a low chance of precipitation. Aid stations, strategically placed every 4-8 miles, are highly praised by runners for being exceptionally well-stocked with a variety of fuel options and staffed by an army of encouraging volunteers, often including permanent bathrooms or port-a-potties.

Whether you're pushing for a new personal best or soaking in the stunning Black Hills scenery, the Lean Horse promises a first-class event. While the 50M, 30M, and 20M races begin at the Custer Football/Track Complex, all distances culminate with a triumphant finish at the same complex, where dedicated volunteers and fellow runners create an inspiring atmosphere. Runners consistently rave about the beautiful, runnable course and the exceptional support, making this a highly recommended ultra for its challenging yet accessible terrain and memorable experience.