Mount Tom
Peak · 9,025 ft · Mammoth Lakes corridor
Mount Tom is a 9,025-foot peak in the Mammoth Lakes corridor, approached from the Inyo National Forest via Highway 395. A scramble with avalanche terrain and exposed ridges, it offers quick alpine access and unobstructed views of the Sierra crest.
Mount Tom sits in the wind shadow of the Sierra crest until afternoon, when gusts funnel up from the valley floor. Morning calm typically holds until late morning; by early afternoon, wind averages 8 mph with peaks above 20 mph. Temperature at elevation hovers near 36 degrees Fahrenheit on average. Snowpack persists into late spring; assess avalanche hazard before travel.
Over the last 30 days, Mount Tom has averaged a NoGo Score of 36, with wind averaging 8 mph and temperatures holding near 36 degrees Fahrenheit. Conditions have ranged from nearly calm (5 score) to marginal (65 score), tracking seasonal transition weather. The week ahead reflects typical late-spring variability; crowding remains light (2.0 average). Plan for afternoon wind and lingering snowpack.
30 days back / 7 days forward
Today's score by factor
About Mount Tom
Mount Tom sits at 9,025 feet in the Inyo National Forest east of Mammoth Lakes, accessed via US Highway 395 from the south or north. The standard approach is a steep scramble from Horton Lakes trailhead, lying roughly 20 miles south of Mammoth village. The peak offers straightforward access to high-Sierra terrain without the permit requirements or crowds of nearby Yosemite or Whitney-corridor destinations. Elevation gain and technical sections limit traffic; base popularity remains low, making it a solid choice for solitude-seeking peak baggers.
The 30-day average temperature of 36 degrees Fahrenheit reflects late-spring snowpack at this elevation. Wind averages 8 mph but peaks above 20 mph in afternoon hours, driven by valley heating and Sierra passes. The last 30 days have yielded NoGo Scores ranging from 5 (excellent) to 65 (marginal), indicating variable stability in late spring. Crowding averages just 2.0 on rolling 30-day data, substantially lighter than Highway 395 corridor destinations south and west. Winter and early spring snow blocks access entirely; by late spring, approach conditions depend on recent melt and aspect.
Mount Tom suits experienced scramblers comfortable with exposure, loose rock, and avalanche terrain assessment. The approach demands winter or spring mountaineering skills; snowpack and avalanche hazard are dominant concerns through May. Summer ascents face intense afternoon wind, making early starts essential. Parking at Horton Lakes is limited; plan for weekend bottlenecks during the few accessible weeks of late spring and early summer. The ESAC avalanche center (Eastern Sierra Avalanche Center) is the relevant forecast resource; check before any winter or spring travel.
Nearby alternatives include Basin Mountain and the Mammoth Crest, both offering similar elevation and wind exposure with slightly easier approaches. Mount Morrison, south on Highway 395, trades avalanche terrain for steeper scrambling but sees comparable afternoon wind. For wind-sheltered peak options, consider Mammoth Mountain's north slopes or the High Sierra Trail network west toward Ione Lake. Mount Tom's defining advantage is its avalanche terrain and high-Sierra character; it rewards early-morning timing and solid snow assessment skills.