Illinois Pass

Managing agency

White River NF — Aspen-Sopris RD

Illinois Pass is a 3.6-mile loop trail located in Colorado near the town of Colorado, managed by the White River National Forest Aspen-Sopris Ranger District. The trail gains 826 feet of elevation throughout the route, making it a moderate hike suitable for a range of fitness levels. This loop configuration allows hikers to experience varied terrain and scenery without retracing their steps. The elevation gain is distributed across the loop, providing a gradual to moderate climb depending on which direction you choose to hike. The trail is situated within White River National Forest, part of the Aspen-Sopris Ranger District, which encompasses a diverse landscape in central Colorado. The area offers typical high country terrain with forested sections and scenic vistas. Illinois Pass is accessible year-round, though conditions vary seasonally. Summer and early fall typically provide the most favorable hiking conditions, while winter snow may impact trail passability. For current conditions, trail closures, or specific regulations, contact the Aspen-Sopris Ranger District directly. Proper preparation, including adequate water and weather-appropriate gear, is recommended for all hikers.