Mount Agassiz
Peak · 13,894 ft · Eastern Sierra corridor
Mount Agassiz rises to 13,894 feet in the Eastern Sierra, a glacially-sculpted peak east of the Sierra crest. Wind-exposed and accessible only in summer months, it demands early starts and avalanche awareness.
Wind accelerates through the afternoon as thermal circulation strengthens; morning conditions are markedly calmer. Temperatures average 19 degrees Fahrenheit across the rolling 30-day period, with gusts reaching 46 mph. Exposure increases with elevation gain. Head out before 10 a.m. to avoid the strongest afternoon flows.
Mount Agassiz has averaged a NoGo Score of 37 over the last 30 days, with wind averaging 12 mph and temperatures holding at 19 degrees Fahrenheit. The rolling window shows highs near 65 on protected days and lows near 9 when wind and cold align. Watch the next seven days for any shift from the typical afternoon wind regime; sustained gusts above 20 mph will compress safe climbing windows to early morning only.
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About Mount Agassiz
Mount Agassiz sits on the Eastern Sierra crest near Bishop, California, accessed primarily via Highway 395 and the Bishop Pass road or the Ag Pass approach from the Owens Valley. The peak lies within the range of the Eastern Sierra Avalanche Center and carries significant avalanche terrain on its north and east aspects. Most parties approach from the east via the Inyo National Forest, a 2 to 3 hour drive from Bishop. The mountain is glacially-carved and snow-covered from November through June; late July through September represents the primary climbing window. Winter ascents are possible but require advanced avalanche assessment and mountaineering skill.
The rolling 30-day average temperature of 19 degrees Fahrenheit reflects late-season spring conditions; at 13,894 feet elevation, Mount Agassiz receives regular precipitation and retains snow deep into summer. Wind averages 12 mph but regularly exceeds 30 mph by afternoon, with recorded gusts to 46 mph. Crowding remains low (average 2.0 on the rolling index), typical of high-altitude Sierra peaks. Early morning calm periods last until 9 or 10 a.m., after which thermal wind and orographic acceleration make climbing progressively hazardous. Plan to summit and descend before noon to avoid afternoon instability.
Mount Agassiz suits experienced mountaineers comfortable with rock, ice, and mixed terrain at altitude. Parties should carry avalanche rescue gear, know how to read snowpack, and move quickly through exposed sections. The peak is best for climbers with high-altitude acclimatization and rock scrambling skills; it is not a beginner's walk. Crowding is negligible; parking at trailheads is rarely constrained. Plan for a full alpine start (dark departure) and allow 10 to 12 hours roundtrip. Afternoon thunderstorms are common in summer; descent in electrical activity is dangerous at this exposure.
Mount Agassiz is part of the Bishop Pass complex and sits within a few miles of Hurd Peak and Muriel Peak. The peak is more exposed and higher than nearby peaks in the Bishop Basin, making it windier and colder. Hikers seeking alpine scenery without mountaineering exposure should consider the Bishop Pass trail or the peaks accessible from North Lake. Mount Agassiz is for mountaineers; casual weekend hikers should start on lower, more forgiving terrain in the Eastern Sierra corridor and build skill before committing to this peak's avalanche terrain and technical exposure.