Long Mountain
Peak · 11,492 ft · Yosemite corridor
Long Mountain crowns the high Sierra east of Yosemite Valley at 11,492 feet. A winter and spring objective in the Yosemite corridor, it sits exposed to afternoon winds and sustained avalanche terrain.
Wind averages 12 mph but regularly gusts over 30 mph by mid-afternoon, funneling off the adjacent high country. Morning windows close early; by noon the peak is windy and hostile. Snow persists into late spring; wet-slab and corniced-ridge hazards dominate late-day descents.
Over the past 30 days, conditions have averaged a score of 33 with temperatures near 22 degrees Fahrenheit and winds averaging 12 mph, peaking at 40 mph. The corridor remains cold and unsettled. Plan for calm mornings only; afternoon winds are the rule, not the exception. Crowding stays minimal (average 3 out of 10), but avalanche hazard and weather volatility are the real constraints.
30 days back / 7 days forward
Today's score by factor
About Long Mountain
Long Mountain rises at the eastern edge of the Yosemite high country, roughly 20 miles northeast of Yosemite Valley via Highway 120. The peak anchors a cluster of 11,000-foot summits above Tenaya Lake and the Tioga Pass corridor. Access typically begins from the Highway 120 corridor or from the Mono Basin side via Highway 395, depending on season and snowpack. Winter and early spring closures of Highway 120 often push approach routes through longer Mono County access. The peak sits in complex, glaciated terrain with multiple ridges and cirques; route-finding in whiteout or deep snow requires map and compass competency.
Long Mountain sits firmly in the high-elevation winter and spring zone. The 30-day average temperature of 22 degrees Fahrenheit is typical for late April; the rolling 365-day minimum dips to 9 degrees and maximum reaches 35 degrees, reflecting the full winter-to-early-summer swing. Avalanche terrain is extensive; the peak and approach gullies hold unstable snowpack through May and June in most years. Wind is relentless. The 30-day average wind speed of 12 mph masks the afternoon reality: gusts routinely exceed 30 mph, and the rolling 30-day maximum of 40 mph represents common late-day conditions, not extremes. Crowds are trivial (average 3 out of 10), a function of both difficulty and the short weather window.
Long Mountain is a mountaineer's peak, not a hiker's destination. The climb demands competent snow travel, route-finding in featureless terrain, and avalanche hazard awareness. Late-season ascents (June onward) may be possible in low-snow years, but the standard approach window is a narrow band in late spring when snow consolidates but the peak is still accessible. Experienced parties plan for a pre-dawn start from the Highway 120 corridor or from the eastern side. Afternoon thunderstorms, corniced ridges, and wind-loaded slopes are the dominant hazards in early summer. Solo travel and unfamiliar terrain increase risk sharply. Parties with avalanche beacons and formal training in slope stability assessment are the norm.
The Yosemite corridor offers multiple high-elevation alternatives within similar distance. Tenaya Peak, directly south, is marginally lower and slightly less exposed to afternoon wind. Dana Plateau, to the east above Mono, trades peak-bagging for a gentler summit plateau but still sits in avalanche terrain. Both share Long Mountain's narrow seasonal window and volatile afternoon weather. For lower-elevation options with longer seasons, Yosemite Valley trails and the Cathedral Range peaks to the south open earlier and close later. The High Sierra Loop from Tuolumne Meadows (accessible via Highway 120 when open) offers comparable climbing terrain with marginally more shelter and slightly earlier accessibility in spring.