Eocene Peak
Peak · 11,576 ft · Yosemite corridor
Eocene Peak is an 11,576 ft summit in the Yosemite corridor of the Sierra Nevada, sitting above glacially-carved terrain. A high-alpine objective with exposure to afternoon wind and spring avalanche risk.
Wind averages 16 mph across the rolling 30-day window and frequently spikes to 42 mph by afternoon. Exposure increases with elevation gain; sheltered approach gullies give way to exposed ridges. Morning calm typically breaks by mid-day. Cold persists year-round; the 30-day average sits at 21°F.
The 30-day average score is 33, with wind holding steady at 16 mph and temperatures averaging 21°F. The week ahead will show whether spring snowpack remains stable or begins to consolidate rapidly. Watch for afternoon wind surge and any uptick in crowding after Highway 120 reopens to the corridor.
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About Eocene Peak
Eocene Peak stands at 11,576 ft in the high Sierra, accessed via the Yosemite corridor on Highway 120. The peak sits in avalanche terrain tracked by the Sacramento Avalanche Center (SAC). Primary approach routes funnel through early-season snowpack and expose hikers to wind-loaded slopes above 10,000 ft. Base popularity is low (0.2 rating), reflecting the technical nature of the approach and the avalanche hazard mandate. Most traffic arrives from the west via Highway 120; the eastern Sierra approach via Highway 395 is longer and rarely preferred for this peak.
Spring conditions dominate the 30-day average: 21°F and 16 mph wind are consistent with snowpack consolidation at elevation. Wind peaks at 42 mph, driven by pressure gradients over the Sierra crest. Crowding averages 3 (light), typical for early-season alpinism when access is limited by snow and avalanche risk. The rolling 365-day data shows temperature swings from 8°F in winter to 34°F in late summer, and maximum wind remains capped at 42 mph year-round. Winter and spring avalanche terrain is the governing constraint; late summer (August to early September) sees stable snow and lower wind, but also peak tourist traffic on Highway 120.
Eocene Peak suits experienced high-alpine scramamblers and ski mountaineers comfortable with avalanche terrain and self-rescue. The low base popularity reflects high barriers to entry: avalanche literacy is mandatory, and spring snowpack is impassable without winter climbing gear. Parties planning ascents should depart at dawn to clear ridges before afternoon wind peaks at 42 mph. The 30-day average crowding of 3 means parking is rarely congested, but late-summer weekends see spikes after Highway 120 opens. Avoid the peak during rapid consolidation cycles in spring when slab avalanche hazard increases.
Nearby alternatives in the Yosemite corridor include Cathedral Peak and Matthes Crest, both lower and less avalanche-dependent than Eocene. The Cathedral Range watershed drains north and south from the Sierra crest; Eocene Peak sits on the drainage divide. Summer conditions (late August onward) are more stable than spring, but crowding rises sharply. Winter ascents require full alpine training and route-finding through steep gullies. Spring skiers may find good descent lines if consolidation is slow; check SAC forecasts before committing.