High Lonesome 100
Mount Princeton, United States • 17-18 Jul 2026
High Lonesome 100
The High Lonesome 100 is an endurance race located in the Sawatch range of the Colorado Rocky Mountains. The course follows a loop format primarily on single track trails, with small sections of mining roads, gravel paths, and paved surfaces. The route incorporates segments of the Continental Divide and the Colorado Trail, passing through remote basins and over five alpine passes. Participants traverse two ghost towns and navigate several ridges throughout the event.
Technical features of the course include:
- Distance: 101 miles
- Total Elevation Gain: 23,500 feet
- High Point: 13,100 feet
- Average Elevation: 10,600 feet
- Low Point: 8,150 feet
The terrain consists of 66% single track, 21% mining roads, 10% gravel roads, and 3% paved roads. Runners have a time limit of 37 hours to complete the course. The event starts and finishes at County Road 321 near Mount Princeton, Colorado. Registration includes a variety of items such as a t-shirt, professional photographs, and live runner tracking. Finishers receive a belt buckle handmade in Colorado. The event is managed by experienced mountain runners and emphasizes a community atmosphere based on classic mountain racing traditions. Visit the organization's website for the most recent information.