Colby Mountain
Peak · 9,639 ft · Yosemite corridor
Colby Mountain is a 9639 ft peak in the Yosemite corridor of California's Sierra Nevada. Exposed alpine terrain with sustained wind and winter snowpack; typically calmer in early mornings.
Wind accelerates through the afternoon, often reaching 35 mph on exposed ridges. Morning hours are notably calmer. Temperature swings 14 to 42 degrees Fahrenheit across the year. Spring snowpack creates avalanche hazard on steeper slopes; late summer offers safer access but afternoon gusts intensify.
Over the last 30 days, Colby Mountain has averaged a NoGo Score of 31 with an average wind of 10 mph and temperatures around 28 degrees Fahrenheit. The week ahead will track typical spring patterns: expect morning calm windows before afternoon wind develops. Check avalanche conditions through the Sierra Avalanche Center before any winter or early-spring ascent.
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About Colby Mountain
Colby Mountain sits at the eastern rim of the Yosemite corridor, a high-Sierra peak accessed primarily via Highway 120 (Tioga Road) from the west or Highway 395 from the east. The mountain stands in avalanche terrain managed by the Sierra Avalanche Center. Approach routes funnel through Tenaya Lake drainage and surrounding granite benches. Base popularity is low; the peak draws backcountry hikers and mountaineers rather than casual visitors. Winter closure of Highway 120 typically isolates this peak from November through late spring, making summer and early fall the primary access windows.
Colby Mountain's weather is shaped by its elevation and exposure. The 30-day average temperature sits at 28 degrees Fahrenheit with a rolling maximum wind of 35 mph; the yearly range spans 14 to 42 degrees. Wind is the dominant pattern factor. Mornings are noticeably calmer, with gusts accelerating sharply by mid-afternoon as thermal mixing intensifies. The average wind speed of 10 mph masks significant daily swings. Crowding averages 3 on a 1 to 10 scale, reflecting the peak's backcountry isolation. Spring snowpack creates sustained avalanche hazard on couloirs and gullies; late June through September offers the safest climbing window, though afternoon wind remains relentless.
Colby Mountain suits experienced mountaineers and backcountry hikers comfortable with exposure, alpine scrambling, and objective hazards. Afternoon winds make summit attempts a first-light affair; climbers launch at dawn and aim to descend ridge terrain before 2 p.m. Winter and early-spring ascents require avalanche training and awareness. Snow persistence extends into July in typical years. Parking at trailheads along Highway 120 near Tenaya Lake or the Highway 395 corridor fills early on weekends; midweek or early-morning starts reduce conflict. The peak's low base popularity means solitude, not a given summit crowd.
Colby Mountain pairs naturally with ascents of nearby Cathedral Range peaks and Tenaya Lake basin explorations. Mount Hoffmann and Tenaya Peak offer similar elevations and climbing grades within the same drainage. Visitors who sample Colby Mountain during stable weather windows often extend to multi-day traverses linking the eastern Yosemite peaks. Weather window frequency is higher in September when both wind and crowding tend lower than spring. Avalanche terrain awareness is non-negotiable; consult the Sierra Avalanche Center forecast before any winter or spring visit.