Hell Creek 100

Event overview

Hell Creek 100 takes place October 3-5, 2025 near Sylvan Grove, Kansas at the Switchgrass trail head (Wilson State Park). Distances offered:

• Pure Hell 140
• 100 Miler
• 100K
• 20 Miler

Registration closes Sunday, September 28. The start/finish location GPS is N38°54.965 W98°30.549. Runner tracking will be available every 20 miles. Professional race photos will be taken by Mile 90 Photography. Minimum age to race is 18.

Course, aid, rules, and logistics

All races use the Switchgrass Mountain Bike Trail at Wilson State Park and are run as 20-mile loops (1 loop for 20 milers; 3 loops for 100k; 5 loops for 100-milers; 7 loops for Pure Hell 140). Elevation gain per distance: 20-mile 2,024 ft, 100k 6,072 ft, 100-mile 10,120 ft, Pure Hell 140 14,168 ft. The trail is single-track with limited tree cover and views of Wilson Lake.

There are two manned aid stations (start/finish and "Hell Hill") plus one unmanned water station at mile 5; the longest distance between water points is 6.25 miles. Drop bags are allowed at both manned aid stations. Pacers are permitted only for the 100 and Pure Hell 140 after three laps and only from manned aid stations; no muling is allowed. Crew access is limited to the two manned aid stations (20-milers may not have crew at Hell Hill). Runners must carry a means to hold water at all times. Cutoffs are set by elapsed time: 20-mile 10 hours, 100k 24 hours, 100-mile 32 hours, Pure Hell 140 52 hours. Deferral/credit policy: 100% credit prior to 45 days, 75% prior to 30 days, 50% prior to 14 days; no credit within 14 days. Visit the organization's website for the most recent information.