Niwot's Challenge

Niwot's Challenge is a highly demanding ultramarathon held annually in Sedalia, Colorado, along the South Platte River in the Front Range. Modeled after the grueling Barkley Marathons, it features a mostly off-trail course requiring advanced navigation skills using map and compass, with no GPS allowed. The event offers three levels of completion: the Burn Loop (~24 miles, +10,000′ elevation), the Chief's Loop (~50 miles, +20,400′ elevation), and the Deity status (~100 miles, double loops in reverse order).

Aid is very limited, and participants must be self-sufficient. The race fosters a close-knit community with secretive course details and a strong emphasis on safety and preparedness. Visit the organization's website for the most recent information.