High Lonesome 100
Mount Princeton, United States • 17-18 Jul 2026
High Lonesome 100 course overview
The High Lonesome 100 is a 100 mile loop trail race in the Sawatch Range of the Colorado Rockies, starting and finishing at County Road 321 near Mount Princeton, Colorado. The course crosses San Isabel and Gunnison National Forests and Colorado State Lands, and is permitted by the United States Forest Service, Chaffee County, and the Colorado Land Board.
The route totals about 23,300 feet of elevation gain, with an average elevation near 10,426 feet, a high point around 13,100 feet, and a low point near 8,200 feet. The course uses 27 miles of the Continental Divide Trail and 35 miles of the Colorado Trail, and passes over five alpine passes and through two historic ghost towns.
Terrain is a mix of approximately 66% singletrack, 27% mining roads, 3% gravel roads, and 4% paved roads. Aid stations are staffed by experienced 100-mile race personnel. Runners and crews can access downloadable course materials including full maps, GPX and KMZ files, turn-by-turn directions, and four printable course quads. A 37 hour race cutoff applies. Visit the organization's website for the most recent information.