High Lonesome 100
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High Lonesome 100 - Course overview
The High Lonesome 100 is a high elevation loop trail race in the Sawatch Range of the Colorado Rocky Mountains, held July 17-18, 2026. The route covers approximately 100 miles with about 23,500 feet of total elevation gain and an average elevation just over 10,400 feet. The course reaches a high point near 13,100 feet and a low point in the 8,100 to 8,200 foot range.
The route runs through National Forest and state lands in Chaffee County and is fully permitted through the United States Forest Service, Chaffee County, and the Colorado Land Board. The loop includes long sections of singletrack and stretches on the Continental Divide Trail and the Colorado Trail, with both ridge and basin terrain. Runners pass through two historic ghost towns, cross five alpine passes, and spend a portion of the course above tree line where exposure and weather can change rapidly. The race uses multiple aid stations staffed by experienced 100 mile race veterans and enforces a 37 hour cutoff.
Course materials such as full maps, GPX and KMZ files, and printable course quads are provided for planning and navigation. The event is organized by an all volunteer team and has been held since 2017. Visit the organization's website for the most recent information.
