Telluride Mountain Run 65 Mile 2026

The Telluride Mountain Run 100K covers roughly 65 miles through the San Juan Mountains above the historic mining town of Telluride, Colorado, typically held in late August. This is high-altitude mountain running at its most demanding, with significant elevation gain that takes runners above 13,000 feet across exposed ridgelines and alpine terrain. The course weaves between old mining roads, technical singletrack, and alpine tundra, crossing mountain passes and summits where the thin air becomes a constant factor. Runners move through dramatically changing landscapes—from forested valleys to stark, colorful high-alpine zones that the San Juans are known for. Much of the route travels above treeline with extended exposure, and weather can shift quickly at these elevations. Aid stations are spaced roughly every 10-12 miles, with pacers allowed from around mile 35 to the finish. This race suits experienced mountain ultrarunners comfortable with technical terrain and high-altitude challenges. The 32-hour cutoff reflects the course's difficulty, but the elevation and exposure are the real tests here. Runners who thrive on sustained climbing, don't mind long stretches above treeline, and have solid high-altitude experience will find this rewarding. Those newer to mountain ultras or altitude may find the combination overwhelming.