The High Lonesome 100 is a challenging ultra-marathon trail race located in the Sawatch Range of the Colorado Rocky Mountains. With 23,500' of vertical gain and reaching an elevation of 13,150', this race is known for its demanding course. Runners will experience beautiful singletrack trails, pass through ghost towns, traverse alpine passes, and explore remote basins and ridges over the course of 37 hours. The race is organized by a dedicated team of volunteers and offers a wonderful community atmosphere. If you're seeking a true mountain race in the spirit of classic 100-milers, the High Lonesome 100 is an ideal choice.

The High Lonesome 100 offers registration information for runners interested in participating in the race. There are also detailed resources available such as the Runner's Guide, rules, required gear, previous results, splits, and course records. For those interested in volunteering at the race, there are various roles available such as course marking, aid station support, and medical team positions. The event is fully permitted through the United States Forest Service and other local authorities.