Lean Horse Ultra Marathon

NEW in 2018! 20 Mile, 30 Mile & 50 Mile are Point To Point!

August 17th-18th, 2018

20 Mile, 30 Mile, 50 Mile & 100 Mile.
Grab your friends and do the 100 Mile Relay!

The Lean Horse 100 has a Great Ultra Marathon Course for first timers and/or those interested in setting a PR.

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.

  • 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
  • A PR Course

  • Surface: Crushed Limestone
  • Course: Mickelson Trail
  • Elevation Profile: Gentle Climbs
  • Where: Custer, South Dakota
  • Average August Temperature: High of 79 Degrees.  Low of 53 Degrees

The Mickelson Trail was originally the Burlington Northern rail line that took trains from Edgemont, SD to the northern Black Hills and the gold mines of the Deadwood area. The trail transverses the beautiful Black Hills of South Dakota. The surface is primarily crushed limestone and gravel, so you will have a consistent running surface throughout the event.

The trail is routinely groomed and maintained through out the year by a very dedicated staff who work for the South Dakota Game, Fish and Parks. With the Mickelson Trail being a former railroad bed, the climbs along the course are gentle but can last for a few miles. For more detailed information regarding the Geoge S. Mickelson Trail view Trail Info, to see a detailed description of every mile of the trail.

View Quick Race Overview
Lean Horse Endurance Run
100M, 100M Relay, 50M, 30M, 20M
August 17th-18th, 2018
*1ooM &  Relay-Friday 12pm
*50M – Saturday 6am  (Point to Point)
*30M- Saturday 8am (Point to Point)
*20M-Saturday 9:30am (Point to Point)
View Full Schedule Here

Registration Info
Registration Status: Currently Open
Registration Closes: August 14, 2018
Register Via Ultrasignup!

Course Overview
Surface: Crushed Limestone
Course: Mickelson Trail
Elevation Profile: Gentle Climbs
Where: Custer, South Dakota
Average August Temp: High of 79 Degrees.  Low of 53 Degrees

100M & 100M Relay
-Out And Back from Custer Track
-Starts Friday 12 pm
-32hr Cutoff
-Total Climb: 7,162 ft.
View Map & Aid Station Info

50 Mile
-Point To Point from DMTM Exchange
-Bus Leaves Custer Track 3:30 am Saturday
-Race Starts Saturday 6am
-14hr Cutoff
-Total Climb: 3,116 ft
View Map & Aid Station Info

30 Mile
-Point To Point from Mystic Aid Station
-Bus Leaves Custer Track 6:15 am Saturday
-Race Starts Saturday 8am
-12hr Cutoff
-Total Climb: 2,202 ft
View Map & Aid Station Info

20 Mile
-Point To Point from Mystic Aid Station
-Bus Leaves Custer Track 8:15 am Saturday
-Race Starts Saturday 9:30 am
-10.5 hr Cutoff
-Total Climb: 1236 ft
View Map & Aid Station Info