50K ultramarathons in South Dakota, United States in 2026

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