Montana trails · Chair Mountain Trilobites
Chair Mountain Trilobites
A 16.1-mile out-and-back in Montana, with 2,860 ft of climbing. Reaches Switchback Pass and other lake/pass/summit destinations.
Elevation profile
The climbing leans toward the first third: 47% of the ascent falls between mile 0.0 and mile 5.4. It gives back about 2,127 ft along the way, so it rolls rather than climbing steadily.
3-D terrain
USGS 3DEP ELEVATION × ESRI WORLD IMAGERY · VERTICAL ×1.5
Reaches
- Switchback Pass (pass)
- Dean Lake (lake)
- Chair Mountain (summit)
- Trilobite Lakes (lake)
Daylight at the trailhead
On August 31, 2026 — the day this page was generated — first light reaches this trailhead at 6:16 a.m., the sun rises at 6:49 a.m. and sets at 8:16 p.m., and the last usable light fades about 8:48 p.m. (MDT) — 13 h 27 min of daylight. At about 2.7 mph plus 30 minutes per 1,000 feet of climbing, the 32.1-mile round trip works out to roughly 14 h 45 min of walking — more than a single day of daylight here, so plan it as an overnight or hike it in sections.
Nearby trails
- Spotted Bear River — 11.4 mi
- Chair Mtn. Trilobites — 11.8 mi
- Two Medicine Pass — 27.6 mi