Tuthell 50K
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TutHell 50K : Tuthill Park, Sioux Falls, SD
TutHell 50K is a looped ultramarathon held at Tuthill Park in Sioux Falls, South Dakota. The course is a roughly 0.31-mile loop run one hundred times, with about 90 feet of elevation gain per loop. Participants must complete the distance within a 12-hour cutoff.
Entry is not by open registration. Prospective entrants submit an essay; there is no general registration and entry is free. Instead of a fee, each runner pledges a donation to a common pot. Organizers cover event costs and the winning male and female runners each select a charity to receive the pooled donations. Donations are tax deductible through the fiscal sponsor Falls Area Singletrack. The event has a limited field, typically 40 to 50 runners.
The event page lists basic event support and expectations: an aid station, timing and tracking, and a recommendation that runners bring their own fuel. Course description directs runners to follow the singletrack, climb and descend a sledding hill area, and return to a marked tree near the facilities. The event has run since 2025 and reported charitable totals across years, with funds distributed entirely to winners' chosen charities. Visit the organization's website for the most recent information.
