Nancy Pass
Peak · 10,180 ft · Yosemite corridor
Nancy Pass (10,180 ft) crowns the Yosemite corridor in the Sierra Nevada, a high alpine crossing between Cathedral Lakes drainage and the Lyell Canyon approach. Winter snow and spring avalanche risk dominate the access window.
Nancy Pass sits fully exposed at high elevation with little shelter from westerly wind. Afternoon gusts are routine; morning calm is the working window. Temperature swings are sharp; expect 30+ degree swings between sun and shadow, and carry layers even in apparent summer conditions.
Over the last 30 days, conditions at Nancy Pass averaged a NoGo Score of 34, with temperatures hovering near 34°F and an average wind of 8 mph. Wind gusts reached 27 mph during peak afternoon hours. The week ahead will test avalanche stability as spring warming continues; monitor the SAC avalanche center forecasts before committing to descent routes through snow-loaded terrain.
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About Nancy Pass
Nancy Pass is a 10,180-foot alpine saddle in the Yosemite corridor of California's Sierra Nevada, roughly east of the Cathedral Lakes basin and north of the Lyell Fork drainage. The pass is reached primarily from the north (Tioga Pass area via Highway 120) or from the south through Yosemite Valley and the High Sierra Camps trail network. Most parties approach via the Cathedral Lakes trail system or as part of a longer Sierra High Route crossing. The pass sits on the boundary between wet-weather exposure and relatively drier eastern Sierra slopes; afternoon wind and temperature inversions are severe.
Elevation and winter snowpack define access. The 30-day rolling average temperature of 34°F reflects a place still locked in spring conditions; ground stays snow-covered well into June in most years. The 30-day average wind of 8 mph masks afternoon acceleration; gusts to 27 mph are common by mid-day. Crowding averages just 3 on the rolling 30-day window, reflecting limited access via snow or late-season scrambling. Winter and early spring are avalanche zones. Late summer and fall offer the safest passage, though afternoon wind becomes the limiting factor.
Nancy Pass suits experienced high-Sierra trekkers and mountaineers comfortable with steep terrain, snow navigation, and avalanche-prone slopes. Parties should expect snow on and near the pass through June; late September through October is the dry, low-avalanche window. Wind accelerates sharply after 10 a.m.; early starts are non-negotiable. Crowds remain low compared to popular Yosemite valley trailheads, but that reflects difficulty, not distance. Navigation is straightforward in clear conditions but whiteout-prone during afternoon storms.
Nearby alternatives include Cathedral Peak (10,935 ft) to the west, accessible via the same drainage and offering gentler terrain once above tree line. Lyell Peak (13,114 ft) and the Lyell Fork crossing to the south provide higher-elevation scrambling and longer crossing options for parties with extra time and skill. For lower-elevation Sierra trekking, the Highway 120 corridor around Tenaya Lake offers faster turnarounds with less avalanche exposure.