Hell Creek 100

OCT
29-31
2027
Multi-distance looped trail event at Wilson State Park near Sylvan Grove, KS featuring 10k to 140 mile options, marked single-track, aid stations, a team relay, and a Halloween costume contest.
29-31 Oct 2027
140 miles 100 miles 100 kilometers 20 miles 10 kilometers

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Hell Creek 100 - Sylvan Grove, KS

Hell Creek 100 is a multi-distance trail event presented by Ultraverse Supplements at the Switchgrass trail head in Wilson State Park near Sylvan Grove, Kansas. The event offers multiple distances and formats on rugged single-track mountain bike trails with open views of Wilson State Park and Wilson Lake.

Available distances

  • Pure Hell 140
  • 100 mile
  • 100k
  • 5-person Team 100 (each runner completes one 20-mile loop)
  • 20 mile
  • 10k

Course and logistics All looped courses use a 20-mile loop configuration for the longer distances; the 10k uses a separate marked route. The course is heavily marked with ribbons, flags, and wrong-way signs. Reported elevation gain per distance ranges from about 442 ft for the 10k to over 14,000 ft for the 140 mile race. Two manned aid stations are located at the start/finish and at "Hell Hill" with an additional unmanned water station at mile 5; the longest gap without water is 6.25 miles. Runner tracking is provided approximately every 20 miles. Professional race photos will be available.

Rules and services Pacers are permitted only for the 100 mile and Pure Hell 140 after roughly three laps, with strict rules against muling and against pacers retrieving items on course. Crew access is limited to the two manned aid stations. Minimum age is 18. Miscellaneous items include distance specific swag, finisher buckles, a costume contest on Halloween with prize credit for top places, and a veteran and active military discount available prior to registration. Visit the organization's website for the most recent information.

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