Marion Pass
Peak · 12,063 ft · Eastern Sierra corridor
Marion Pass is a 12,063-foot alpine crossing in California's Eastern Sierra. Located between the Sierra crest and the Inyo Mountains, it sits exposed to funneling winds and rapid weather shifts typical of high passes.
Wind dominates Marion Pass. Afternoon gusts arrive predictably once thermals build on the east slope, turning calm mornings into sustained blasts by midday. The 12,000-foot elevation means temperatures stay cold year-round; expect single digits in winter and barely above freezing in summer. Exposure here is total; there is no shelter.
Over the past 30 days, Marion Pass has averaged 12 mph wind and a NoGo Score of 37, with peaks near 65 on unsettled days. The 30-day low score of 9 marks the calmest windows. The week ahead follows seasonal spring pattern: morning stability eroding into afternoon wind, with temperature holding near freezing. Plan movement for early daylight and avoid afternoon climbing or exposed travel.
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About Marion Pass
Marion Pass sits at 12,063 feet on the Sierra crest in the Eastern Sierra corridor, roughly 20 miles north-northeast of Big Pine. Access is primarily via the Glacier Lodge Road from US-395 south of Big Pine or from the north via State Route 168 near Cedar Flat. This is not a through-highway pass; most visitors approach it as a destination peak for mountaineers or as a waypoint on Sierra backcountry routes connecting the Inyo Mountains to the Sierra proper. The nearest reliable services are in Big Pine, a 45-minute drive to the south.
Marion Pass sits in avalanche terrain managed by ESAC (Eastern Sierra Avalanche Center). The 30-day average temperature of 19 degrees Fahrenheit and rolling 30-day wind average of 12 mph mask extreme variability; gusts have hit 42 mph within the past month. Winter and spring bring significant snowpack instability on the surrounding slopes, particularly on north and east-facing aspects above 11,500 feet. Summer brings lower avalanche hazard but sustained afternoon wind and afternoon thunderstorm risk. Crowding here is minimal year-round (2.0 average on a 10-point scale), reflecting the technical access and remote location.
Marion Pass suits mountaineers with Sierra experience, ski mountaineers in stable snow windows, and backcountry parties linking routes across the crest. Weather changes fast; approach early in the day when winds are light and visibility is clearest. Winter ascents require current snowpack assessment from ESAC and self-rescue competence; wet-slab avalanche risk is highest in spring warming cycles. Summer routes are less avalanche-prone but more exposed to afternoon lightning. Parking is limited; expect to hike in from nearby trailheads rather than drive to the pass itself.
Marion Pass lies near the southern boundary of the Inyo National Forest and offers views into the Sierra crest drainages to the west and the Inyo Mountains proper to the east. Nearby peaks like Mount Tom (13,652 feet) and the Inyo crests provide alternative objectives with similar high-alpine character but slightly lower elevation. The eastern approach via State Route 168 is typically closed in winter, forcing long winter approaches from the western Sierra crest. Water is scarce; rely on snow or pack in adequate reserves.