Henness Pass
Peak · 6,916 ft · North Sierra corridor
Henness Pass is a 6916-foot peak in California's North Sierra corridor, sitting at the crest of a high-elevation pass with exposure to westerly wind and significant avalanche terrain.
Wind funnels across the pass with a 9 mph 30-day average but gusts to 23 mph on exposed ridges. Cold dominates year-round; 30-day mean sits at 33 degrees Fahrenheit. Morning calm breaks by mid-day as thermal heating drives airflow upslope from the west.
Over the last 30 days, Henness Pass averaged a NoGo Score of 35.0 with temperatures holding at 33 degrees Fahrenheit and average wind of 9 mph. The week ahead carries similar patterns; plan around afternoon wind intensification and avalanche hazard on north-facing slopes where snowpack persists into late spring.
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About Henness Pass
Henness Pass sits on the crest between the North Fork American River drainage to the west and the Yuba River system to the east, accessed via Highway 20 from both the Nevada City side (west) and Highway 49 corridors. The pass itself is a natural saddle at 6916 feet, part of the high Sierra rampart that separates the Sacramento Valley foothills from the alpine interior. Primary approach is from the west via Forest Road 11 (Henness Pass Road); from the east, the route threads through Tahoe National Forest. Drive time from Sacramento is roughly 90 minutes; from the Bay Area, two to two and a half hours via Highway 80 to Highway 20.
Henness Pass sits in a transitional zone between wet maritime air masses and the high-Sierra rain-shadow interior. The 30-day average temperature of 33 degrees Fahrenheit reflects a location that remains cold-locked through spring; annual minimum dips to 21 degrees, while summer highs reach 48 degrees. Wind averages 9 mph over the rolling month but peaks at 23 mph on exposed ridges, most aggressive in the afternoon when heated lowland air rushes upslope. Crowding averages only 5 over 30 days, marking this as a quiet location; traffic spikes briefly after snowmelt opens Forest Service roads in late spring and again in early fall.
Henness Pass suits backcountry travelers, ski mountaineers, and high-Sierra hikers who are competent in avalanche terrain. The pass itself is snow-free by early summer but holds avalanche danger on adjacent north-facing slopes well into May and June. Experienced parties plan around afternoon wind; morning departures from the pass proper minimize exposure to sustained gusts. Parking is limited to pull-offs along Henness Pass Road; crowds remain sparse because access requires a high-clearance vehicle or substantial hiking. Winter and early spring approach requires avalanche awareness and beacon competency; consult the Sierra Avalanche Center before travel.
Nearby alternatives include the Yuba Pass area to the north (more exposed, windier corridor) and the Sierra Buttes region further south (higher altitude, steeper terrain). The North Fork American drainage to the west offers lower-elevation routes with less avalanche exposure but less alpine character. Henness Pass itself is quieter than Highway 49 passes closer to Nevada City and attracts fewer day-trippers than the more famous Lake Tahoe rim access points. For those committed to backcountry access, the pass serves as a gateway to the Downieville ranger district and lesser-traveled ridgelines toward the Middle Yuba River.