Threemile

Managing agency

San Juan NF — Mancos-Dolores RD

Threemile is a 14.3-mile out-and-back trail located in Colorado near the town of Colorado, managed by the San Juan National Forest's Mancos-Dolores Ranger District. The route gains 3,556 feet of elevation, making it a moderately strenuous hike suitable for hikers with solid endurance. The trail's substantial elevation gain is distributed across the round-trip distance, offering consistent climbing throughout the hike. The out-and-back format means you'll retrace the same route on your return, allowing for flexible turnaround points if needed. Threemile is situated within San Juan National Forest, providing access to the scenic high country and diverse ecosystems typical of southwestern Colorado's San Juan Mountains. The trail's managing ranger district maintains the route and can provide current conditions and any seasonal closures. Plan for a full day to complete this hike, bringing adequate water and preparing for elevation gain at altitude. The trail is best tackled during warmer months when snow conditions permit safe travel through the higher elevations.