Trail Running calendar near Custer 2026-2027

Trail and road courses at Tomaha Trail in Hisega, South Dakota offering 30K, half marathon and 10K distances with published maps, shuttle service to starts, member discounts, and a shirt guarantee date before the race.

An annual ultramarathon in the Black Hills of South Dakota on the George S. Mickelson Trail. Races include 100 mile, 50 mile, 30 mile, 20 mile, and a 30 mile CrossFit relay option.

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 at Big Hill near Spearfish SD with 4.167 mile loops and about 375 ft elevation change per loop. New lap starts each hour and the last runner to outpace all others wins.

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.