High Lonesome 100
Mount Princeton, United States • 17-18 Jul 2026
Event overview
The High Lonesome 100 is a 100-mile mountain trail race in the Sawatch Range of Colorado. The 2026 race days are July 17-18. The event is organized by Freestone Endurance and was established in 2017. The race starts and finishes at County Road 321 at the base of Mount Princeton (coordinates: 38.740213, -106.160962). The race has a 37-hour cutoff and is run on lands managed by the United States Forest Service, Chaffee County, and the Colorado Land Board. The event is run by an all-volunteer team and typically needs about 150 volunteers, including aid station staff and medical personnel.
Course details
The route is a single loop that crosses five alpine passes, goes over sections of the Continental Divide and the Colorado Trail, and passes through two ghost towns. Key course facts:
- 100 miles
- 27 miles on the Continental Divide Trail
- 35 miles on the Colorado Trail
The course high point is about 13,100 feet and the low point about 8,200 feet, with roughly 23,300 feet of total elevation gain. The surface breakdown is approximately 66% single track, 27% mining roads, 3% gravel roads, and 4% paved roads. GPX, KMZ, and printable course maps and turn-by-turn directions are provided for detailed route information. Visit the organization's website for the most recent information.