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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.

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Length
12.6 mi
Elevation gain
2,456 ft
Highest point
12,111 ft
Difficulty
Expert
Max grade
39%
Steepest mile
+1,054 ft
Tread at ≥10% grade
3.9 mi
Shape
out-and-back
Surface
dirt
Dogs
yes
Bikes
yes
Horses
06/01-11/15
Managed by
USFS Sulphur Ranger District

Elevation profile

9,667 – 12,094 ft123456789101112

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

3-D terrain view of High Lonesome Trail

USGS 3DEP ELEVATION × ESRI WORLD IMAGERY · VERTICAL ×1.5

Reaches

Heads up

Stream ford: expect at least one unbridged crossing.
Terrain graded T2 (SAC scale).

Getting there

Rollins Pass Trailhead — parking nearby. 39.93509, -105.68219 · directions

Daylight at the trailhead

On August 31, 2026 — the day this page was generated — first light reaches this trailhead at 6:01 a.m., the sun rises at 6:29 a.m. and sets at 7:35 p.m., and the last usable light fades about 8:03 p.m. (MDT) — 13 h 07 min of daylight. At about 2.7 mph plus 30 minutes per 1,000 feet of climbing, the 25.1-mile round trip takes roughly 11 h 45 min, so leaving the trailhead at sunrise puts you back around 6:14 p.m. — 1 h 21 min before sunset.

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