Half Moon Lake
Lake · 8,546 ft · Yosemite corridor
Half Moon Lake sits at 8,546 feet in the Yosemite corridor's high Sierra, a glacially-sculpted alpine basin exposed to afternoon wind and typically quieter than roadside alternatives.
Wind accelerates off the open water by mid-afternoon, funneling down the drainage. Morning conditions are consistently calmer. Snow lingers into spring at this elevation; the 30-day average temperature of 30°F reflects lingering winter. The lake draws light traffic outside peak summer weekends.
Over the last month, Half Moon Lake averaged a NoGo Score of 34, with wind peaking at 29 mph and temperatures hovering at 30°F. Crowding remains low at 6 on the scale. The week ahead looks comparable to the 30-day pattern: expect morning windows before wind builds, and plan for snow or wet conditions depending on recent melt and snowpack stability.
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About Half Moon Lake
Half Moon Lake lies in the eastern Sierra high country, part of the Yosemite corridor's alpine lake cluster. Access via Highway 120 (Tioga Pass Road) heading east from Yosemite; the lake sits off established trails in the high Sierra, typically approached from the Mono Basin side or as a multi-day backcountry objective. The 8,546-foot elevation places it above the tree line in exposed terrain. Parking and trailhead infrastructure reflect its modest popularity (0.25 base traffic score); this is not a marked, developed destination. Winter and spring conditions demand competent navigation and avalanche awareness, particularly in the approach gullies and surrounding slopes where wet-slab and wind-slab hazards persist through April and May.
The rolling 30-day average wind of 11 mph masks significant time-of-day variation. Mornings from sunrise to mid-morning are noticeably calmer; wind typically picks up by noon and peaks in the afternoon at 29 mph gusts over the last month. Temperature averages 30°F across the 30-day window, consistent with the 90-day average, but the year-round range spans 16°F to 45°F, reflecting the extreme seasonal swings of alpine Sierra terrain. Spring (April to early June) brings rapid snowpack collapse, unpredictable melt-water runoff, and unstable slopes. Summer (late June through August) offers the most stable weather and lowest crowding relative to demand. Fall (September through October) sees afternoon wind decline slightly; this is often the optimal season for reliable conditions and minimal snow.
Half Moon Lake suits experienced backcountry users, ski mountaineers, and minimalist campers seeking isolation. The low crowding metric (6 on the scale) reflects light foot traffic; this is not a destination for casual day hikers or families seeking developed amenities. Paddlers and swimmers face cold water temperatures even in summer and exposure to afternoon wind gusts. Avalanche terrain awareness is non-negotiable in winter and spring; the surrounding slopes are prone to wind slabs and wet slides. Bring navigation gear, a detailed topo map, and current avalanche forecasts from the Shasta Avalanche Center (SAC). Plan for multi-day self-sufficiency; no water treatment infrastructure or rescue services are proximate.
Nearby alternatives in the Yosemite corridor include Tenaya Lake (lower elevation, more protected parking) and the Mono Basin lakes accessed from Highway 395, which typically offer calmer morning conditions but higher crowds. Half Moon Lake's defining advantage is isolation and alpine character; its defining challenge is exposure to afternoon wind, lingering snowpack (particularly problematic for spring access), and low visibility during weather. Visitors planning a trip should consult real-time NoGo Score trends, current avalanche bulletins, and recent trip reports before committing. This is a place for deliberate travel, not spontaneous visits.