Trail Running calendar near Custer 2026-2027

Caveman Fun Run is a trail running event at Flying V Trails near Newcastle, Wyoming offering 5K, 10K and 20K courses on single-track and double-track trails. Packet pickup is available the day before and check-in is required on race day.

A stair-focused event in Hot Springs SD with three routes from a 2 mile Sock Hop to a 13.1 mile half, family activities, and options for walkers and leashed dogs.

A weekend XTERRA trail running event in Deadwood, South Dakota offering marathon, half marathon, 5K, kids run and a marathon relay, with a USATF certified marathon and World Series qualification slots.

A fast downhill 5 km on the Mickelson Trail in Deadwood during the Deadwood Mickelson Trail Marathon weekend. A 1 km kids race is held the same day.

Trail ultramarathons around Sturgis, South Dakota on June 26 and 27, 2026 offer 100 mile, 50 mile, 50K and 30K options. Courses use the Centennial and Deerfield trails, include multiple aid stations, and provide bus transport to remote star..

Trail races near Hisega, SD offering a 30K, a 12.37-mile half marathon, and a 10K out and back from Hisega Lodge. Courses include notable elevation gain; registration fees vary and Black Hills Runners Club members receive discounts.

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.

Test your endurance at Big Hill Trails with a 3 or 6 hour mountain bike race or trail run. Support child advocacy in South Dakota while navigating flowy single track loops through the scenic Black Hills National Forest.

A backyard ultra on Big Hill near Spearfish with hourly 4.167 mile loops and about 375 feet of climb per lap. Runners repeat loops until one competitor completes one more lap than any other.