Box Lake
Lake · 10,492 ft · Mammoth Lakes corridor
Box Lake sits at 10,492 feet in the high Sierra above Mammoth Lakes, a snow-fed alpine lake ringed by sparse conifers and talus. Wind and cold dominate; conditions are marginal most days.
Wind funnels off the open water by early afternoon, typically 13 mph sustained with gusts to 39 mph. Morning calm gives way to chop within hours. Water temperature stays near freezing year-round; the 30-day average sits at 18 degrees Fahrenheit. Plan for alpine exposure and sudden weather swings.
Box Lake's 30-day average score of 37 reflects persistent wind and cold typical of high-elevation basins in the Mammoth corridor. The last month saw lows near 6 and peaks to 65; the week ahead will likely track the season's pattern of frigid nights and afternoon gusts. Crowding averages 4 out of 10, so solitude is reliable, but avalanche terrain above the lake demands winter awareness.
30 days back / 7 days forward
Today's score by factor
About Box Lake
Box Lake drains a cirque basin southeast of the Ritter Range in the high Sierra, roughly 20 miles northwest of Mammoth Lakes village via Highway 203 and backcountry trails. Elevation sits at 10,492 feet; the lake occupies a glacially-carved depression with steep talus slopes and sparse whitebark pine on the lower margins. Primary access is a full-day alpine hike from the Mammoth Lakes area trailheads; no road access exists. Summer use runs light; winter and spring access requires mountaineering skills and snow travel competency. The Easton Sequoia Avalanche Center (ESAC) monitors the region; avalanche terrain is present on the peaks and steep gullies flanking the lake.
Conditions here are firmly alpine. The 30-day average wind speed of 13 mph understates the afternoon surge; sustained gusts hit 39 mph regularly. Temperature averages 18 degrees Fahrenheit over the rolling 30 days, with the annual range from 4 to 31 degrees. The lake is frozen most of the year; open water appears briefly in late summer, but wind chop renders paddling marginal at best. Crowding averages just 4 out of 10 across the rolling month, making Box Lake a true backcountry destination. Snowpack usually persists through June; approach routes remain snow-laden or impassable until early summer melt. Afternoon wind is the dominant constraint for any activity; calm conditions occur only in early morning or during storms.
Box Lake suits experienced alpinists, mountaineers seeking high-elevation traverse camps, and backcountry skiers staging winter ascents of nearby peaks. Summer hikers find it a destination for cross-country trekking and alpine lake photography; water is too cold and turbulent for swimming. Winter and spring access requires avalanche awareness, crampons, and rope skills; the steep flanks and gully systems above the lake hold dangerous slabs after heavy snow. Parking and supplies depend entirely on staging from Mammoth Lakes or the June Lake area. No services, water treatment, or overnight facilities exist at the lake; all water must be purified. Plan for self-sufficiency and prepare for sudden cold and wind even in July.
Nearby alternatives in the Mammoth corridor include Mammoth Lake itself, warmer, lower, and far busier; Duck Lake, slightly lower and more sheltered; and the higher lakes north of the Ritter Range, which face similar wind and avalanche exposure. Box Lake's defining trait is isolation combined with reliable high-altitude conditions. Visitors comparing it to more popular Sierran lakes will find no crowds, no amenities, and no room for error. It is a place for committed alpinists, not casual day-trippers.