• Lassen Peak from Hat Creek

    Lassen Volcanic

    National Park California

There are park alerts in effect.
show Alerts »

  • Road through the park is closed

    Park highway (HWY 89) is currently being cleared of snow, debris, and rocks. Anticipated opening for Memorial Weekend. More »

  • Park highway under construction near Sulphur Works

    Road crews are working to repair the road near Sulphur Works hydrothermal area. Road will be closed at the Kohm Yah-mah-nee Visitor Center during the week, and open to Sulphur Works on the weekends.

Environmental Factors

Crags Lake

High elevation lakes, including Crags Lake, at Lassen Volcanic NP in California are particularly sensitive to nitrogen and sulfur deposition.

NPS Photo

Air Quality
Most people who visit national parks expect clean air and clear views. However Lassen Volcanic National Park lies downwind of the populated Sacramento Valley and areas of agriculture and manufacturing. Pollutants emitted from these sources can harm the park's natural and scenic resources such as vegetation, surface waters, and visibility. Read more...

Climate Change
Lassen provides water for five California watersheds and habitat for hundreds of wildlife species. These resources are faced with changes influenced by climate change. Lassen and the National Park Service are taking action to both measure and mitigate climate change affects. Read more...

Phenology
Phenology is the study of the timing of life cycle events in organisms. Lassen Volcanic is one of seven pilot parks in California helping to establish park phenological monitoring projects. Lassen's phenology program relies heavily on scientific observations provided by citizen scientists like you. Read more...

Did You Know?

reddish color microscopic snow alage

The reddish color sometimes observed on top of snow at Lassen Volcanic NP snow is a living organism called snow algae.  When snow begins to thaw, these microscopic organisms spring to life.  They function as a primary food source and are being studied for their cancer-fighting properties.