Embrace the challenge of the Hell Creek 100, an unforgettable trail running event taking place over the Halloween weekend, starting October 30, 2026, in Sylvan Grove, KS. Hosted at the breathtaking Wilson State Park, this race offers a spectrum of distances: 100M, 100K, 20M, and 10K, catering to various levels of ultra-endurance athletes. Anticipate typical race day conditions with highs around 64F and lows near 36F, alongside a mere 5% chance of precipitation, providing ideal crisp autumn weather for your endeavor.

The entire race unfolds on the acclaimed Switchgrass Mountain Bike Trail, a rugged, easy-to-follow single-track course that promises "beautiful views of Wilson State Park and Wilson Lake". Don't let Kansas's reputation fool you; the Hell Creek 100 is renowned for having "the most elevation gain and loss of any 100-miler in Kansas," featuring over 10,120 feet of climbing for the 100-mile distance. Long-distance events are structured as demanding 20-mile loops, providing consistent challenges and scenic rewards.

Runners benefit from two well-stocked manned aid stations—at the start/finish and "Hell Hill," which you'll encounter twice per loop—offering a variety of food, including vegan options, and hot meals overnight, with convenient drop bag access. The festive "Halloween at Hell Creek" atmosphere includes a costume contest, while "Fur-Baby Awards" celebrate your canine (or feline) running partners. Experience a truly unique and challenging race that commits 2% of entry fees back to the Switchgrass trails for maintenance.