Hell Creek 100

Dorrance, United States • 30-1 Oct-Nov 2026

Hell Creek 100 Race Series

The Hell Creek 100 is a multi-distance ultra running event held on the Switchgrass Mountain Bike Trail at Wilson State Park, with views of Wilson Lake. Distances offered include a 10K, 20-mile, 100k, 100-mile, and 140-mile (Pure Hell) option.

  • 10K
  • 20 miles
  • 100k
  • 100 miles
  • 140 miles

Course and logistics

The course consists of approximately 20-mile loops with no repetition of loop sections: one loop for the 20-mile race, three loops for the 100k, five loops for the 100-mile, and seven loops for the 140-mile. The 10K is a shortened version of the loop and will use a cutoff. The trail is rugged single-track with very few trees and is heavily marked with ribbons and wrong-way signs. Elevation gain figures are provided by distance: 10K - 442 ft; 20-mile - 2,024 ft; 100k - 6,072 ft; 100-mile - 10,120 ft; 140-mile - 14,168 ft.

Restrooms are available at the start/finish, with porta-potties at the Hell Hill aid station. There is no on-course aid station for the 10K, so 10K participants must carry their own supplies. Hot showers are available year-round at the start/finish and at Big Bluestem Campground about 3/4 mile away. Aid stations will feature Proxima C electrolyte/carbohydrate drink and typical aid station items. Photographers will take pictures that are available free to download within 1-2 weeks.

Awards, swag and special rules

Male and female top three finishers in each category will receive awards. Finishers receive distance-specific swag and a beer; examples include shirts and drawstring bags for 10K and 20-mile, a 100k buckle for 100k finishers, and a 100-mile buckle for 100-mile finishers (a sub-24-hour buckle replaces the 100-mile buckle). The Pure Hell 140 finishers receive a specific finishers' buckle. The Pure Hell 140 requires proof of a previous 100-mile finish to register. A costume contest runs during the event with cash-equivalent race credit prizes for top three places. Visit the organization's website for the most recent information.

Race information

140 mi
Pure Hell 140
100 mi
Hell Creek 100
100 km
100k
20 mi
20-Mile
10 km
10k
Visit the organization's website for the most recent information.
Trail runs nearby

Take on rugged single track at Wilson State Park with the Hell Creek Half and 50K, featuring lakeside views and punchy climbs. Choose a 13 mile loop or the full 50K and enjoy fully marked trail and staffed aid stations.