Big Horn Lake
Lake · 10,856 ft · Yosemite corridor
Big Horn Lake sits at 10,856 feet in the Yosemite Sierra Nevada corridor, a glacially-fed alpine basin exposed to sustained afternoon winds. Winter access requires avalanche-terrain awareness and reliable snowpack.
Wind accelerates off the open water by mid-afternoon, averaging 14 mph with gusts to 30 mph. Morning calm typically lasts until late morning. The lake is colder and windier than sheltered Yosemite Valley basins at lower elevation. Plan paddling and fishing for first light; skip afternoons unless conditions flatten.
The 30-day rolling average wind speed is 14 mph with temperatures averaging 24 degrees Fahrenheit. Crowding remains light at 6 visitors on average. The week ahead shows typical spring volatility: expect calm mornings and wind-driven afternoons. Check avalanche forecasts from the SAC if approaching via snow-covered terrain.
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About Big Horn Lake
Big Horn Lake lies in the high Sierra backcountry of the Yosemite corridor at 10,856 feet elevation. Access is via Highway 120 corridor routes leading to trailheads in the Mono Basin or eastern Sierra. The lake sits in a glacially-carved cirque with open exposure to the west and south. No maintained roads reach the lake; all approaches are foot traffic or pack stock. The nearest gateway towns are Lee Vining and Mammoth Lakes to the east, each 60 to 90 minutes by car. Winter access is limited to experienced backcountry travelers; snowpack persists into late spring, and avalanche terrain surrounds the approach drainages.
Conditions at Big Horn Lake follow a predictable diurnal pattern driven by elevation and basin exposure. The 30-day average temperature is 24 degrees Fahrenheit; the year-round minimum drops to 10 degrees and maximum reaches 39 degrees. Wind is the dominant constraint. The rolling 30-day average wind speed is 14 mph, with maximum gusts reaching 30 mph. Mornings are typically calm, but by midday thermal circulation and drainage winds funnel off the lake, building through afternoon. Crowding averages 6 visitors, making the lake genuinely quiet compared to popular Yosemite Valley destinations. Late spring and early fall offer the best overlap of stable weather and reliable access. Midsummer sees occasional afternoon thunderstorms. Winter and early spring require avalanche awareness; the SAC avalanche center covers this area.
Big Horn Lake suits backcountry fishers, mountaineers, and experienced backpackers seeking solitude at high elevation. The cold, wind-scoured water supports native trout. Visitors should plan for overnight or multiday trips; day-hikes from lower trailheads are long. Afternoon wind makes paddling risky; bring a stable craft and know water conditions before launching. No commercial outfitters operate here. Snow camping requires a protected site away from wind-loaded slopes. Late September through early October offers the most stable weather window; wind is still present but more moderate, and snowpack has cleared. Bring layers; temperature swings of 25 to 30 degrees between sun and shade are common even in summer.
Nearby alternatives include Mono Lake and its tributary basins, which sit lower and offer more protected bays and less avalanche terrain. Yosemite's Tenaya Lake and Mirror Lake are 60 to 90 minutes away but far more popular and lower in elevation, with calmer wind patterns. The eastern Sierra lakes around Mammoth and June Lakes offer similar high-altitude exposure but with more developed trailhead access. Experienced visitors often pair Big Horn Lake with ascents of nearby summits in the Cathedral Range or Sierra Crest, leveraging the same approach and backcountry logistics.