Montana trails · West Fork Rock Creek
A 10.6-mile out-and-back in Montana, with 3,160 ft of climbing. Reaches Sentinel Falls and other lake/pass/waterfall destinations. Managed by the U.S. Forest Service.
The climbing leans toward the final third: 48% of the ascent falls between mile 7.1 and mile 10.6. It climbs almost continuously, with little descent to recover on.
WEST FORK — parking nearby, restroom, water. 45.16852, -109.49553 · 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 6:38 a.m. and sets at 7:57 p.m., and the last usable light fades about 8:27 p.m. (MDT) — 13 h 19 min of daylight. At about 2.7 mph plus 30 minutes per 1,000 feet of climbing, the 21.3-mile round trip takes roughly 11 h 02 min, so leaving the trailhead at sunrise puts you back around 5:40 p.m. — 2 h 17 min before sunset.