Big Grizzly Mountain
Peak · 5,167 ft · Yosemite corridor
Big Grizzly Mountain is a 5,167-foot peak in the Yosemite corridor of California's Sierra Nevada. Alpine exposure and funneled wind make timing critical for safe approach.
Wind accelerates off the adjacent lake and ridgeline by mid-afternoon, especially in spring and early summer. Morning hours are calmer. High elevation and avalanche terrain demand stable snowpack assessment in winter and spring; cornices and wind slabs form readily on north and east aspects.
The rolling 30-day average wind of 7 mph masks frequent afternoon gusts to 22 mph. Average temperature sits at 50 degrees Fahrenheit with crowding typically light (3 out of 10). Watch the week ahead for wind spikes that favour early starts and mid-morning descents. Winter snowpack stability is essential before late spring approach.
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About Big Grizzly Mountain
Big Grizzly Mountain stands at 5,167 feet in the high Sierra east of Yosemite Valley, accessible via Highway 120 from the west or Highway 395 from the east. The peak sits within the Yosemite corridor and drains into the Tuolumne River system. Primary approach is from the Lee Vining area or Tioga Pass gateway; total drive time from Yosemite Valley is 90 minutes to 2 hours depending on route. Snow closes Highway 120 (Tioga Pass Road) winter months, restricting access to Highway 395 approaches. Low base popularity means parking and trailhead congestion are minimal outside peak summer weekends.
Conditions at Big Grizzly Mountain are shaped by elevation, alpine exposure, and proximity to open water and ridgeline. The 30-day average wind of 7 mph climbs to 22 mph peak gusts, concentrated in afternoon hours when thermal circulation kicks in. Average temperature over 30 days is 50 degrees Fahrenheit; winter minima drop to 39 degrees and summer highs reach 68 degrees. Spring and early summer (April through June) see the steepest wind and temperature swings. Crowding averages 3 out of 10, allowing flexible scheduling. Avalanche terrain dominates the north and east-facing approaches; late spring wind-slab and cornice collapses are common after storms or wind events.
Big Grizzly Mountain suits experienced Sierra peakbaggers, climbers comfortable with avalanche terrain, and winter mountaineers who can assess snowpack. Summer ascents avoid avalanche risk but face afternoon wind that can pin lighter hikers. Spring approaches demand stable snow assessment before departure; consult the Sierra Avalanche Center (SAC) advisories for the region. Early morning windows (before 10 a.m.) offer the best conditions; skip afternoons if wind gusts exceed 15 mph. Parking at trailheads fills only during the first two weekends after Highway 120 opens in late spring. Bring microspikes for firm snow and carry crampons for steep snow gullies.
Nearby alternatives in the Yosemite corridor include Tioga Peak and other high-Sierra passes along Highway 120. Cathedral Range peaks to the west offer similar elevation and avalanche exposure with slightly lower wind sensitivity on some aspects. Lee Vining Creek drainage and the eastern Sierra access routes provide different views and fewer crowds but less stable snow conditions in spring. Big Grizzly Mountain is less trafficked than Cathedral Peak or Mount Dana, making it preferable for solitude-seeking climbers willing to navigate avalanche terrain responsibly.