Trail Running calendar near Custer 2026-2027

Trail races on the Mickelson Trail between Rochford and Deadwood, South Dakota on June 6 to 7, 2026, including marathon, half marathon, five person relay, 5K and kids 1K; fields are limited and fees vary by date.

A multi-distance trail event near Sturgis, SD featuring a roughly 108-mile 100M plus 50M, 50K and 30K courses on the Centennial and Deerfield trails, with aid stations, drop bag options and bused starts. Held under USFS and BLM permits.

Lean Horse Ultra is a multi-distance trail running event on the George S. Mickelson Trail in the Black Hills, held July 31 to August 1, 2026, with 100 mile, relay, 50, 30, and 20 mile options and a CrossFit edition.

A last runner standing backyard ultra at Big Hill near Spearfish, SD, with 4.167 mile laps and about 375 feet of elevation change per loop. Trails are wide and the event is hosted by a local non profit running club.