Guyot Pass
Peak · 10,925 ft · Eastern Sierra corridor
Guyot Pass sits at 10,925 feet in the Eastern Sierra, straddling the Sierra crest between Inyo and Mono counties. A high alpine crossing with avalanche terrain, it demands early starts and stable snowpack.
Wind funnels across the exposed crest by mid-afternoon, with gusts regularly reaching 45 mph on unsettled days. Morning calm between dawn and mid-day is the reliable window. Cold persists year-round; expect 22 degrees Fahrenheit as the 30-day average, dipping to 5 degrees in winter.
Over the past 30 days, Guyot Pass averaged a NoGo Score of 37, with wind hovering at 12 mph but spiking to 45 mph on bad days. Temperature averaged 22 degrees Fahrenheit; crowding stayed minimal at 2 out of 10. The week ahead will track similar patterns: head here on calm mornings before afternoon wind loads the crest.
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About Guyot Pass
Guyot Pass is a high-alpine crossing on the Sierra crest in the Eastern Sierra corridor, lying between the Inyo National Forest and Mono Basin at 10,925 feet. The pass sits roughly 60 miles south of Mammoth Lakes and 40 miles northwest of Bishop via US Highway 395. Primary access is from the Mammoth Lakes area via Highway 203 and the Mammoth Lakes Road network, or from the Bishop side via US 395 north to Aspendell or local pack trails. The Sierra crest here is steep and exposed; the pass itself is rocky and wind-scoured for much of the year.
Winter conditions dominate from November through April, with avalanche terrain on approach slopes and the pass corridor itself. Snowpack is variable; early season (November to December) offers softer snow but unstable slabs, while March through April presents consolidated but persistent coverage. The 30-day average temperature of 22 degrees Fahrenheit reflects spring conditions; winter lows drop to 5 degrees. Average wind of 12 mph masks the exposure: gusts reach 45 mph regularly, and afternoon wind surge is nearly certain. Crowds are minimal year-round (2 out of 10 average); the pass sees only experienced ski mountaineers and high-altitude hikers.
Guyot Pass suits ski mountaineers with avalanche safety skills and high-altitude endurance. Summer (late July through early September) offers the most stable conditions, with snow typically gone by August and rock scrambling replacing ski descent. Expect whiteout risk in spring and early summer due to afternoon cloud buildup. Parking is minimal; most access requires a full day or overnight pack-in. Check avalanche forecasts from ESAC (Eastern Sierra Avalanche Center) before any winter or spring approach. The 365-day max wind of 45 mph and avalanche terrain mean solo travel or small groups only; roped travel may be necessary on steep snow slopes.
Nearby alternatives include Mammoth Crest and the trails around Mammoth Lakes Village for lower-elevation views without avalanche exposure. Directly south lies the San Joaquin Mountain complex, offering similar high-alpine terrain but slightly lower and more accessible. To the north, the peaks around Convict Lake provide comparable ridge walking without the sustained avalanche hazard. Guyot Pass is a destination for experienced mountaineers; it is not a casual day hike and demands early season reconnaissance and stable weather windows.