Idaho trails · Mount Harrington
A 10.2-mile out-and-back in Idaho, with 2,037 ft of climbing. Reaches Harrington Saddle and other lake/pass/summit destinations. Managed by the U.S. Forest Service.
The climbing leans toward the first third: 53% of the ascent falls between mile 0.0 and mile 3.4. It gives back about 1,863 ft along the way, so it rolls rather than climbing steadily.
On August 31, 2026 — the day this page was generated — first light reaches this trailhead at 5:28 a.m., the sun rises at 5:59 a.m. and sets at 7:19 p.m., and the last usable light fades about 7:50 p.m. (PDT) — 13 h 20 min of daylight. At about 2.7 mph plus 30 minutes per 1,000 feet of climbing, the 20.3-mile round trip takes roughly 9 h 33 min, so leaving the trailhead at sunrise puts you back around 3:33 p.m. — 3 h 47 min before sunset.