Events in Custer, South Dakota | 2026-2027

Lean Horse Ultra Marathon [leanhorseultra.com] [Register at raceroster.com]
Sat, Aug 01, 2026 at 5:00 AM

Description

RACE OVERVIEW

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, a...

RACE OVERVIEW

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, a 20-mile race, and a 30-mile Black Hills CrossFit Edition - Singles, 3, and 6 person relays. The course is held on the George S. Mickelson Trail.

Course Overview

Surface: Crushed Limestone

Course: Mickelson Trail

Elevation Profile: Extended gentle climbs. This is due to the fact the course is on an old railroad bed.

Hosting Town: Custer, South Dakota

Average August daytime temperature: High of 79 degrees. Low of 53 degrees.

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

Marathon Road Run Trail Ultra
Homestead Drive, Custer, South Dakota, 57730, United States
OpenStreetMap Google Maps
Lean Horse Trail Races [finishers.com]
Fri, Aug 14, 2026

Run Trail
Custer, South Dakota, United States
OpenStreetMap Google Maps

2 running, road, and ultra events in Custer, South Dakota