Montana trails · Cleft Rock
A 10.7-mile out-and-back in Montana, with 3,166 ft of climbing. Reaches Seemo Pass and other arch/pass/summit destinations. Managed by the U.S. Forest Service.
The climbing leans toward the first third: 52% of the ascent falls between mile 0.0 and mile 3.6. It gives back about 2,608 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 6:20 a.m., the sun rises at 6:53 a.m. and sets at 8:23 p.m., and the last usable light fades about 8:56 p.m. (MDT) — 13 h 30 min of daylight. At about 2.7 mph plus 30 minutes per 1,000 feet of climbing, the 21.4-mile round trip takes roughly 11 h 06 min, so leaving the trailhead at sunrise puts you back around 5:59 p.m. — 2 h 24 min before sunset.