50K ultramarathons in South Dakota, United States

Scenic mountain loops with approximately 1,200 feet of elevation gain per six-mile circuit, start and finish at Bear Den Chalet

Forgiving running surface and gentle elevation changes in a small town South Dakota setting, with 50 and 100-mile ultramarathon distances.

Rolling hills and wooded trails through Newton Hills State Park, combining lush landscapes with segments of horse paths and an 8-hour 50km cutoff

Short, well-marked loop on grassy slopes and singletrack, with repeated Tut Hill climbs and steady elevation gain and loss each lap.

108-mile out-and-back from Sturgis with Centennial and Deerfield Trails, rugged singletrack, old logging roads, and dirt terrain through forests