Mount Dade
Peak · 13,592 ft · Mammoth Lakes corridor
Mount Dade is a 13,592-foot peak in the Mammoth Lakes corridor of the eastern Sierra Nevada, sitting above glacial drainages east of the main crest. Winter and spring approaches require avalanche terrain awareness.
Wind averages 13 mph over the past month and funnels harder in afternoon hours as thermal circulation strengthens off the eastern slope. Expect 30+ mph gusts on unsettled days. Morning windows before 10 a.m. are markedly calmer. Temperature swing from dawn to afternoon can exceed 15 degrees Fahrenheit; layer accordingly.
The rolling 30-day average wind of 13 mph masks afternoon peaks well above that; recent readings hit 39 mph. Temperature has averaged 18 degrees Fahrenheit across the month, with the next week showing typical spring variability: warming days followed by cold snaps as upper-level systems pass. Crowding remains minimal at 2.0 on the NoGo scale, keeping parking and trail impact low even on weekends.
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About Mount Dade
Mount Dade rises 13,592 feet on the east side of the Mammoth crest, roughly 8 miles northeast of Mammoth Mountain ski resort and accessible via the Mammoth Lakes corridor approach. The standard route climbs from the north through glacial and talus terrain. Highway 395 runs the eastern Sierra backbone; Highway 203 connects Mammoth Lakes town to the main ski area. The peak sits in the Eastern Sierra Avalanche Center forecast zone; winter and spring ascents cross active avalanche paths and require assessment of snowpack stability before committing to the upper mountain.
Conditions at Mount Dade follow classic high-Sierra springtime patterns. The 30-day average temperature of 18 degrees Fahrenheit reflects a mix of cold mornings and warming afternoons as the season progresses. Wind averages 13 mph across the month but frequently exceeds 30 mph in the afternoon, driven by thermal circulation off the eastern escarpment and upper-level flow. Early mornings (before 10 a.m.) see markedly calmer air. Snow persists into late spring above 12,000 feet; snowpack instability is the dominant hazard in April and early May. By late September, conditions transition to stable autumn weather with cooler temperatures and lighter crowds.
Mount Dade suits climbers comfortable with scrambling on loose rock and snow navigation in avalanche terrain. The low crowding score of 2.0 means you will not encounter bottlenecks or parking pressure, even on weekends. Parties should carry avalanche beacons, probes, and shovels in winter and spring; check the Eastern Sierra Avalanche Center forecast before leaving town. Wind exposure on the upper peak is significant; afternoon descents can be punishing. Start early, summit before noon, and descend in daylight. Bring extra layers for the 15+ degree Fahrenheit swing between morning and afternoon.
Nearby alternatives in the Mammoth corridor include Mount Gibbs (12,773 feet) to the northwest and Mono Basin peaks accessed from the June Lake Loop, both lower and less avalanche-prone in spring. Mammoth Mountain itself offers snow stability resources and closer seasonal forecasting. The Owens Valley to the east is warmer and drier; storm systems hit Dade first and hardest. Plan Dade ascents for stable weather windows and avoid steep gullies during rapid snowmelt or recent precipitation.