Colorado trails · High Lonesome Trail
High Lonesome Trail
A 12.6-mile out-and-back in Colorado, with 2,456 ft of climbing, topping out at 12,111 ft. Reaches Devils Thumb Pass and other lake/pass destinations. Managed by USFS Sulphur Ranger District.
Elevation profile
The climbing leans toward the final third: 46% of the ascent falls between mile 8.4 and mile 12.6. It gives back about 1,536 ft along the way, so it rolls rather than climbing steadily.
3-D terrain
USGS 3DEP ELEVATION × ESRI WORLD IMAGERY · VERTICAL ×1.5
Reaches
- Devils Thumb Pass (pass)
- Rollins Pass (pass)
- King Lake (lake)
Heads up
Getting there
Rollins Pass Trailhead — parking nearby. About 2 h 15 min drive (69 mi, 13 of them unpaved) from Silverthorne. 39.93509, -105.68219 · directions
Daylight at the trailhead
On October 14, 2026 — the day this page was generated — first light reaches this trailhead at 6:44 a.m., the sun rises at 7:11 a.m. and sets at 6:24 p.m., and the last usable light fades about 6:52 p.m. (MDT) — 11 h 13 min of daylight. At about 2.7 mph plus 30 minutes per 1,000 feet of climbing, the 25.1-mile round trip works out to roughly 11 h 45 min of walking — more than a single day of daylight here, so plan it as an overnight or hike it in sections.
Nearby trails
- Arapaho Pass Trail — 12.6 mi
- St. Louis Divide Trail — 14.4 mi
- Chicago Lakes Trail — 19.7 mi
- Ute Peak Trail — 21.3 mi