Colorado trails · Conundrum Creek Trail
A 10.1-mile out-and-back in Colorado, with 4,138 ft of climbing, topping out at 12,904 ft. Reaches Triangle Pass and other lake/pass/spring destinations. Managed by USFS Aspen-Sopris Ranger District.
Most of the climbing sits in the final third — 59% of the ascent, between mile 6.7 and mile 10.1. It climbs almost continuously, with little descent to recover on.

USGS 3DEP ELEVATION × ESRI WORLD IMAGERY · VERTICAL ×1.5
Conundrum Creek Trailhead — parking nearby. 39.11921, -106.85608 · directions
On August 31, 2026 — the day this page was generated — first light reaches this trailhead at 6:07 a.m., the sun rises at 6:34 a.m. and sets at 7:39 p.m., and the last usable light fades about 8:07 p.m. (MDT) — 13 h 05 min of daylight. At about 2.7 mph plus 30 minutes per 1,000 feet of climbing, the 20.2-mile round trip takes roughly 11 h 38 min, so leaving the trailhead at sunrise puts you back around 6:12 p.m. — 1 h 27 min before sunset.