Woollyback
Peak · 12,837 ft · Eastern Sierra corridor
Woollyback is a 12,837-foot peak in the Eastern Sierra corridor, sitting above the transition zone between alpine tundra and glaciated cirques. Calmer than the exposed ridges to the east.
Wind drives off the lake basin in mid-afternoon and accelerates through the col. Mornings are substantially calmer. Cold persists year-round; the 30-day average temperature sits at 21 degrees Fahrenheit. Crowds remain sparse; expect solitude on most days.
Over the last 30 days, Woollyback averaged a NoGo Score of 36.0 with wind peaking at 42 mph and an average wind speed of 14 mph. The week ahead shows typical spring volatility. Morning windows are your safest bet; afternoon brings sustained wind off the lake. Avalanche terrain dominates the north-facing drainages; assess the snowpack before committing to gullies or steep approach slopes.
30 days back / 7 days forward
Today's score by factor
About Woollyback
Woollyback stands at 12,837 feet in the high Eastern Sierra, accessed via U.S. Route 395 from the Mammoth Lakes gateway or Independence. The peak sits in the Sierra Nevada's eastern crest, ringed by glacier-carved cirques and accessible by Class 2 scramble from the Mono Basin side or a longer approach from the western Sierra high country. The nearest trailheads are scattered; most parties gain elevation via the Tungsten Canyon drainage or approach from the Inyo National Forest. Winter and early spring approaches require careful route-finding through avalanche terrain.
Conditions at Woollyback are defined by its position astride the range crest and its exposure to westerly flow funnelling through the Sierra passes. The 30-day average wind speed of 14 mph masks a pattern: mornings are often near-calm, afternoons consistently strong. The average temperature of 21 degrees Fahrenheit reflects high elevation and winter dominance through April. Crowding averages 2.0, indicating very light use. Late September through early October offers the most stable weather window, with calm mornings more frequent and afternoon wind moderating. Winter and spring are dominated by wind and cold; the maximum wind gust on record for the rolling 365-day window is 42 mph.
Woollyback suits experienced mountaineers comfortable with exposed scrambling and avalanche-terrain awareness. The typical visitor is a peak-bagger or alpine skier planning a multi-day Eastern Sierra traverse. Expect to carry a full winter kit through late spring; snowpack persists above 11,500 feet into June most years. Avalanche terrain is concentrated on north-facing aspects and gullies draining the north cirques; check the ESAC forecast before every approach. Parking at lower trailheads fills only on holiday weekends. The remoteness and technical exposure keep casual traffic minimal.
Visitors combining Woollyback with nearby traverses often link it to Norman Clyde Peak or the Mono Divide peaks to the north. The Eastern Sierra corridor offers numerous 12,000+ foot peaks within a 50-mile radius; many are lower-elevation alternatives if Woollyback's wind or snowpack makes access unsafe. The westbound approach via the Sierra crest rewards planning; early morning starts and descent before mid-afternoon wind are non-negotiable. Water sources are scarce above 11,000 feet; melt from late snowpatches is unreliable until July.