Jackass Mountain
Peak · 3,211 ft · Yosemite corridor
Jackass Mountain is a 3,211-foot peak in Yosemite's high Sierra corridor, positioned on the eastern flank of the range with exposure to afternoon wind funnels off the lake basin.
Wind averages 7 mph over 30 days but climbs sharply in the afternoon; mornings are calmer and clearer. Temperatures range from 40 to 72 degrees across the year, with spring snow lingering into late April. Approach from the west via Highway 120 when conditions allow.
Over the past 30 days, Jackass Mountain averaged a NoGo Score of 32.0 with winds at 7 mph average and maximum gusts to 19 mph. Temperatures have run 52 degrees on average. The week ahead will show whether afternoon wind patterns persist and how snowpack retreat affects access from the Highway 120 corridor.
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About Jackass Mountain
Jackass Mountain sits at 3,211 feet in the Yosemite corridor of California's Sierra Nevada, straddling the transition zone between mid-elevation forest and high-Sierra granite. Access is primarily from the west via Highway 120, which connects the Central Valley to Tioga Pass. The peak's low base popularity reflects its minimal infrastructure and backcountry character; it is not a front-country trailhead destination. Winter closure of Highway 120 (typically November through late April or May) determines seasonal access; plan around California Department of Transportation snow-clearing schedules.
Conditions at Jackass Mountain reflect its elevation and exposure. Average temperatures run 52 degrees over the last 30 days, with a yearly low near 40 degrees and highs reaching 72 degrees in midsummer. Wind averages 7 mph across rolling 30 days but peaks to 19 mph during afternoon thermal development. The 30-day NoGo Score of 32.0 reflects moderate stability; scores drop below 10 in settled windows but spike above 50 when wind and instability align. Spring snowpack persists into late April and May at this elevation; route-finding and avalanche awareness are mandatory when approaching from the Highway 120 corridor during melt season.
Jackass Mountain suits experienced backcountry travelers comfortable with exposure and avalanche terrain. The peak draws few casual weekend hikers because of its remoteness and the need to navigate snow-fed drainages and open granite in spring and early summer. Avoid weekend crowds by visiting midweek; the average crowding score of 3.0 (on a scale where lower is less crowded) reflects low overall traffic. Plan for afternoon wind by starting early and descending by midday. Carry avalanche safety gear (beacon, probe, shovel) through May; the SAC avalanche center covers this terrain, and the peak's aspect and snowpack history demand caution on north and east-facing slopes.
Nearby destinations in the Highway 120 corridor include Tenaya Lake (calmer and lower, more suited to paddlers seeking protected water) and peaks along the Cathedral Range to the southwest. Jackass Mountain is smaller and less trafficked than classic Yosemite summit objectives but offers unobstructed views of the lake basin. Winter and early spring bring avalanche complexity that Yosemite Valley peaks do not; the trade-off is solitude and direct access to high-Sierra granite without permit queues or parking constraints.