Mount Patterson
Peak · 11,653 ft · Yosemite corridor
Mount Patterson is an 11,653-foot Sierra peak in Yosemite's eastern corridor, sitting above the High Sierra plateau northeast of Tenaya Lake. Winter and spring ascents demand avalanche awareness and precise timing.
Wind dominates; the 30-day average sits at 15 mph with gusts to 41 mph common in afternoon hours. Morning ascents are calmer and colder. Snowpack persists through spring, and cornices form on ridges. Afternoon thermals drive wind upslope by mid-day.
Over the last 30 days, Mount Patterson has averaged a NoGo Score of 34 with temperatures hovering around 23°F and winds at 15 mph. The coming week shows typical spring volatility: expect warming and stronger afternoon wind. Check avalanche forecasts from SAC before any approach; snowpack stability can shift rapidly with temperature swing.
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About Mount Patterson
Mount Patterson crowns a ridge system in the Yosemite corridor roughly 8 miles northeast of Tenaya Lake, on the eastern edge of the High Sierra plateau. Access is primarily from Highway 120 via the Tioga Pass corridor or from Mammoth Lakes to the south. The peak sits in complex terrain with multiple approach options; most routes cross sustained snow into spring and require winter mountaineering skills. The standard approach follows high basins and ridgelines; parties lacking experience with avalanche terrain, self-rescue, and navigation on steep snow should hire a guide or wait for established summer conditions.
Mount Patterson sits at 11,653 feet in a zone where winter lasts into June. The 30-day temperature average of 23°F reflects current spring conditions; expect mean daily highs in the 30s to low 40s and overnight lows well below zero at peak elevation. Wind averages 15 mph with frequent gusts above 30 mph, peaking in afternoon hours as thermals surge upslope. Crowding is minimal at 3.0 on the rolling 30-day scale; few parties attempt the peak outside established summer season. Snow coverage remains substantial through May; spring corn cycles create brief morning windows of safer travel before noon sun destabilizes the surface.
Mount Patterson suits winter mountaineers and spring ski mountaineers with crevasse rescue competence and avalanche course credentials. SAC avalanche forecasts are mandatory; the peak sits in terrain prone to wet-slab and wind-slab instability during spring warming and high-wind events. Ascents in winter demand glacier travel skills and fixed anchors for descent. Parking at Tenaya Lake or trailheads near Highway 120 fills quickly on weekends in early summer; off-season and early spring approaches avoid crowds but require self-sufficiency and bail-out plans. Exposed ridges funnel wind; afternoon descents can turn dangerous fast. Solo travel is not advised.
Nearby peaks in the same corridor include Mount Conness (12,590 feet) to the north and Cathedral Peak (10,911 feet) to the west. Conness offers a more direct approach from Highway 120 with similar exposure to wind and snow. Cathedral Peak is lower, more accessible in late spring, and draws more traffic. Mount Patterson's isolation and technical snow terrain make it a logical pairing for winter mountaineers already committed to the Tioga Pass corridor. The region's access is tied to Highway 120 seasonal closure; routes become reliably snow-free only after mid-June in typical years.