Learn and Explore
The 30-mile Lassen Volcanic National Park Highway traverses avalanche-prone slopes with up to 2,000 foot drops and can hold a snowpack up to 40 feet deep. Snow clearing operations usually begin in March or April and continues for about two months before the highway is entirely open.
Road Clearing Operator Log
Log updates are posted when reports are received from road crew members. The latest update may not reflect the current status. The road crew works Monday through Thursday, 10 hours per day.
When Will the Highway Open to Through Traffic?
Road crews begin clearing snow from the park highway in March or April, depending on snow depth and weather forecasts. It is not possible to predict when the highway will open to through traffic, because weather and other delays can affect the clearing process significantly. A chart below provides opening and closing dates of the park highway since 1980. The park does not clear snow from Butte Lake, Warner Valley, or Juniper Lake Roads. The paved sections of Warner Valley and Juniper Lake Roads are maintained by Plumas County and are usually not plowed.
Snow clearing operations occur in the following order:
What's the Delay?
Clearing the park highway is no quick or easy undertaking! Snow accumulates on the 30-mile park highway throughout the winter season (typically November through April). Snow depth can reach up to 30 feet at the highest elevations, with drifts occasionally reach as high as 40 feet. The road clearing process can take up to three months due to numerous factors including:
Spring Road Opening Dates - 1980 to Present
Last updated: April 9, 2021