Old Army Pass Trail

Overview

This is the classic high-country approach to Mount Langley via the Cottonwood Lakes basin, topping out at Old Army Pass (~12,000 feet) where you step into Sequoia National Park. Expect a mellow start from Horseshoe Meadow before rolling through forest and meadows into a string of glassy alpine lakes beneath Langley’s stark south face. The character changes beyond Cottonwood Lake #4: the switchbacks up Old Army Pass are steep, exposed, and unmaintained, climbing a slope that looks like a wall from below—thrilling for some, unnerving for others.

For context on distance: it’s about 10.5 miles one way from the trailhead to the summit of Mount Langley via Old Army Pass, with roughly 4,002 feet of gain. The first 6.5 miles are on a maintained path; the final ~4 miles are on a well-worn but unmaintained route, and the last ~300 vertical feet to the summit involve class 2 scrambling with plenty of holds (a short section can feel closer to class 3). If you’re turning around at the pass instead of the summit, your day will be shorter.

Scenery and Experience

The Cottonwood Lakes basin is wide-open High Sierra: wonderfully green meadows, crystal-clear lakes, and early-morning mirror reflections of Mt. Langley if you’re out before the breeze. Trees thin around 11,000 feet and the terrain transitions to barren, beautiful granite slabs and talus near and above timberline. From the crest, you get a rare two-sided panorama—Owens Valley dropping over 8,000 feet to the east and big Sequoia backcountry rolling to the west. Expect a few simple log crossings over gentle streams in the lower miles.

Difficulty and Hazards

Old Army Pass is not maintained. Early season snow and ice linger on its upper switchbacks and can turn the climb into a no-fall zone for the unprepared. Later in summer the route is dry, steep, and exposed to sun and wind. Above the pass toward Langley, footing shifts to very fine, energy-sapping sand with occasional scrambling and loose rock; rockfall is possible, so helmets and spacing are smart near the summit block. If exposure bothers you, consider the alternative New Army Pass instead.

Logistics and Tips

• Start well before sunrise to bank cool miles and dodge typical afternoon thunderstorms.
• Download maps ahead of time; cairns help near the summit but you’ll appreciate a track for the unmaintained sections.
• Treat all water—lakes and streams see heavy use. Bear boxes, vault toilets, and a spigot are at the Horseshoe Meadow trailhead; parking is straightforward and doesn’t require a parking permit.
• Dogs are allowed on the approach outside the park, but once you crest into Sequoia National Park, pets are not allowed on trails (service animals excepted).
• Overnight trips require a wilderness permit.

Best Time to Hike

Mid-July through August is the sweet spot most years: the pass is typically melted out, days are long, and sunrise lights up the lakes for photography. Earlier in the season, expect lingering snow and ice on the pass—this is when skilled parties may carry an ice axe and crampons. Go midweek for fewer campers around the lakes and aim to be in the basin at first light for the calmest reflections and coolest temps.

Route Notes

From Horseshoe Meadow, follow the Cottonwood Lakes Trail toward the basin. Ignore the signed junction to New Army Pass if your goal is Cottonwood Lakes and Old Army Pass. Beyond Lake #4, the Old Army Pass path climbs sharply in tight switchbacks; a trail marker at the top welcomes you into Sequoia National Park. From there, the grade eases along the crest toward Langley, with cairns aiding route-finding near the summit.