Trail Running calendar near Custer 2026-2027

Ultrarunning event on the George S. Mickelson Trail in Custer South Dakota, July 31 to August 1 2026, with multiple distances on crushed limestone.

Time-based mountain bike and trail run event at Big Hill Trails supporting Northern Hills Area CASA, with 3- and 6-hour race options, team entries, aid stations, participant lunch, camping allowed, and cash prizes for breaking 6-hour bike r..

Backyard Ultra on the Big Hill trails near Spearfish SD where runners repeat 4.167 mile loops with 375 ft gain until one runner completes one more loop than others.

A weekend of march and marathon events on the Mickelson Trail near Deadwood honoring veterans, with distances from 16 to 110 miles, team and individual formats, military divisions, and rest stops every 3 to 5 miles.

Final race of the 2026 Black Hills Runners Club Trail Series at Alkali Trailhead in Sturgis, SD, with 10K and 18K courses through rolling hills and pine singletrack; youth entries are listed as free.