Agassiz Col
Peak · 13,097 ft · Eastern Sierra corridor
Agassiz Col sits at 13,097 feet in the Eastern Sierra, a high-altitude pass between Inyo and Mono counties with exposure to afternoon winds and avalanche terrain requiring winter caution.
Wind dominates the col. Morning hours are typically calmer, but afternoon funneling off the lake drainage pushes speeds upward. The exposed ridgeline catches weather systems early. Snowpack stability drives winter conditions; spring corn and wet slabs are common hazards.
Over the last 30 days, the average NoGo Score was 37.0, with winds averaging 12 mph but gusting to 46 mph. Temperatures averaged 19 degrees Fahrenheit, and crowds remained light at 2.0 on the scale. Watch the week ahead for afternoon wind trends and any fresh snow that may destabilize slopes.
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About Agassiz Col
Agassiz Col is a high-altitude pass linking the Inyo and Mono drainages in the Eastern Sierra corridor of California's Sierra Nevada. The col sits at 13,097 feet and is accessed most directly from the south via the Sierra-area trailheads near the Inyo National Forest. Highway 395 runs parallel to the Eastern Sierra front 30 to 40 miles east; Highway 120 provides western approach routes through the high country. The col is a waypoint on longer traverse routes rather than a destination in itself, making it best suited for experienced alpinists and ski traversers rather than day hikers.
Winter and spring conditions define Agassiz Col. The 30-day average temperature is 19 degrees Fahrenheit, with maximum winds reaching 46 mph during that period. Snow persists from November through June; spring avalanche hazard is significant due to rapid snowpack metamorphosis and solar loading on south-facing slopes. Summer sees temperatures climb to 32 degrees Fahrenheit at the col's elevation, but storms still occur. The low base popularity (0.2) reflects the technical nature of approach and the avalanche-terrain awareness required. Crowds are minimal year-round; solitude is the default.
Agassiz Col is best suited for winter mountaineers, ski traversers, and climbers with avalanche rescue training and beacon proficiency. The col itself offers no shelter and limited camping options; most users are transit-focused rather than camping on-site. Plan approaches during stable weather windows; avoid the col during or within 48 hours after heavy precipitation or rapid temperature swings. The Eastern Sierra Avalanche Center (ESAC) issues forecasts for this zone; check conditions before every trip. Bring crampons, axes, and rope for winter ascent and descent.
Nearby alternatives include higher passes in the Sierra crest (Kearsarge Pass to the south, Glen Pass to the north) and longer traverses across the high country via the High Sierra Trail system. Agassiz Col differs from those routes by offering a shorter, steeper pass with less established infrastructure. Climbers often pair the col with attempts on peaks visible from the pass or use it as a link in multi-day ski or climbing traverses. The isolation and technical requirement mean weather and avalanche risk are non-negotiable factors; this is not a casual day outing.