Montana trails · Boulder Pass
Boulder Pass
A 29.6-mile point-to-point in Montana, with 3,491 ft of climbing. Reaches Brown Pass and other glacier/lake/pass destinations. Managed by the National Park Service.
Elevation profile
Most of the climbing sits in the middle third — 78% of the ascent, between mile 9.9 and mile 19.8. It gives back about 3,977 ft along the way, so it rolls rather than climbing steadily.
3-D terrain
USGS 3DEP ELEVATION × ESRI WORLD IMAGERY · VERTICAL ×1.5
Reaches
- Brown Pass (pass)
- Boulder Pass (pass)
- Lake Janet (lake)
- Upper Kintla Lake (lake)
- Boulder Glacier (glacier)
Daylight at the trailhead
On August 31, 2026 — the day this page was generated — first light reaches this trailhead at 6:17 a.m., the sun rises at 6:50 a.m. and sets at 8:20 p.m., and the last usable light fades about 8:53 p.m. (MDT) — 13 h 30 min of daylight. At about 2.7 mph plus 30 minutes per 1,000 feet of climbing, the 29.6-mile route takes roughly 12 h 43 min, so leaving the trailhead at sunrise puts you back around 7:33 p.m. — 46 min before sunset.
Nearby trails
- Stoney Indian Pass — 7.3 mi
- Swiftcurrent Pass — 14.8 mi
- Gunsight Pass — 23.5 mi