About
The Lean Horse 100 is celebrated as an ideal ultra-marathon for first-timers, thanks to its forgiving running surface and gentle elevation changes. Despite evolving through the years, the race has maintained its charming "small town" atmosphere. Lean Horse is dedicated to providing an unforgettable experience, drawing runners from around the globe to South Dakota to tackle the 50 and 100-mile distances.
Races
50K
Aug 1, 2026 (Sat)
Distance
50 km
Terrain
Trail
Course
Out & back
Elevation gain
1,700 ft
Elevation loss
1,700 ft
Difficulty
Beginner
Cutoff time
10h
Course record (M)
3:39:11
Course record (F)
3:43:50
50mi
Aug 1, 2026 (Sat)
Distance
50 mi
Terrain
Trail
Course
Out & back
Elevation gain
2,659 ft
Elevation loss
2,659 ft
Difficulty
Intermediate
Cutoff time
16h
Course record (M)
6:03:33
Course record (F)
6:23:27
100mi
Jul 31, 2026 (Fri)
Distance
100 mi
Terrain
Trail
Course
Out & back
Elevation gain
5,887 ft
Elevation loss
5,887 ft
Difficulty
Intermediate
Cutoff time
30h
Course record (M)
15:14:15
Course record (F)
16:55:30
Weather history
Temperature
57°F / 78°F
Feels like
54°F / 78°F
Avg sunshine hours
13h 25m
Avg rainfall
0.09 in
Avg snowfall
-
Max wind speed
10.6 mph (Gentle breeze)
Sweat loss rate
High
Trail conditions
Dry, firm, runnable trail
