21st Lean Horse Ultra-Marathon 100 Mile
21st Lean Horse Ultra-Marathon 100 Mile is a 161 km ultramarathon in Custer, SD, United States, taking place on Aug 14 – Aug 15, 2026.
- Date
- Aug 14 – Aug 15, 2026
- Distance
- 161 km
- Location
- Custer, SD, United States
- Format
- Fixed distance