Lean Horse takes place on Jul 31, 2026. That's in 4 months.

Where is Lean Horse located?

Lean Horse is held in Custer, South Dakota, United States.

What distances are available at Lean Horse?

Lean Horse offers the following distances: 100M, 100M.

What is the typical weather for Lean Horse?

Based on historical data, you can expect temperatures between 57°F and 80°F on race day. There's approximately a 13% chance of precipitation.

Lean Horse (100M) - Jul 31, 2026 | Custer, SD

Embark on an unforgettable journey through the heart of the Black Hills with the Lean Horse Ultra, a premier rails-to-trails ultramarathon held in scenic Custer, South Dakota. On July 31, 2026, runners will tackle the challenging yet runnable 100-mile course, renowned as an excellent choice for both seasoned ultrarunners and those aiming for their first hundred-mile finish. The course primarily follows the George S. Mickelson Trail, a converted railroad bed featuring a forgiving crushed limestone surface and gentle, extended climbs that offer a welcome reprieve from technical terrain. As you traverse this picturesque route, you'll be treated to breathtaking scenery of forested landscapes, unique rock formations, and the chance to spot local wildlife, all contributing to an immersive natural experience.

The Lean Horse 100-mile race starts at the Custer YMCA, with a maximum elevation of 6,262 feet and a total climb of 7,162 feet. Aid stations, generally well-spaced along the course, offer essential hydration and a variety of fuel options, with permanent bathrooms or port-a-potties available at each stop. Drop bag access for 100-mile participants ensures you have crucial supplies at strategic points. Typical race day conditions in late July see comfortable highs around 80°F and lows around 57°F, with a relatively low 13% chance of precipitation, creating favorable running weather.

Beyond the physical challenge, the Lean Horse is celebrated for its distinctive "small town" feel and the dedicated race crew committed to making each runner's ultra experience truly special. Whether you're chasing a personal best on its smooth, non-technical paths or simply soaking in the beauty of the Black Hills, the Lean Horse offers a uniquely rewarding ultramarathon adventure, culminating at the finish line located at the Custer high school track.