SeasonMapWhat's on in Lassen Volcanic National Park, United States through the year
Lassen Volcanic National Park, United States has 6 curated events through the year — 1 natural spectacle, 2 seasons, 1 hazard season and 2 seasonal openings. The ones to plan around: Park highway opens (May) and Meadow wildflowers (July).
Updated September 2026 · every event curated and sourced · dates for 2026 where they are announced, the usual window where they are not
Best time to visit Lassen Volcanic National Park: weather, crowds and notes →
Lassen Volcanic National Park events and crowds by month
| Month | What starts | Crowds |
|---|---|---|
| January | — | Busy |
| February | — | Quiet |
| March | Spring under snow | Busy |
| April | — | Shoulder season |
| May | Park highway opens | Shoulder season |
| June | — | Busy |
| July | Meadow wildflowers, Bumpass Hell boardwalk season | Busy |
| August | Wildfire smoke season | Busy |
| September | — | Busy |
| October | — | Shoulder season |
| November | — | Busy |
| December | Winter at the southwest entrance | Busy |
January in Lassen Volcanic National Park
Lassen Volcanic National Park weather in January →Busy — Winter / Christmas break in United States, school holidays in 2 of the markets that fill it
Nothing new starts in January.
Still on: Winter at the southwest entrance (1 Dec – 14 Mar)
February in Lassen Volcanic National Park
Lassen Volcanic National Park weather in February →Quiet — one of its worst months for weather
Nothing new starts in February.
Still on: Winter at the southwest entrance (1 Dec – 14 Mar)
March in Lassen Volcanic National Park
Lassen Volcanic National Park weather in March →Busy — Spring break in United States
- Season
Spring under snow
15 Mar – 31 MayOff-season shutdownClosuresThe park highway is still buried — April is usually the deepest snow of the year at the southwest entrance — and only the two ends of the road are drivable. You can ski or walk up the closed highway, which is the best way to have it to yourself. Source ↗
Still on: Winter at the southwest entrance (1 Dec – 14 Mar)
April in Lassen Volcanic National Park
Lassen Volcanic National Park weather in April →Shoulder season — an ordinary month
Nothing new starts in April.
Still on: Spring under snow (15 Mar – 31 May)
May in Lassen Volcanic National Park
Lassen Volcanic National Park weather in May →Shoulder season — an ordinary month
- Opening
Park highway opens
25 May – 31 Oct · usuallyTrail seasonThe road over the shoulder of Lassen Peak usually clears between late May and mid-June, but has opened as late as the end of July after a heavy winter. Nothing about a summer trip here works until it does. Source ↗
Still on: Spring under snow (15 Mar – 31 May)
June in Lassen Volcanic National Park
Lassen Volcanic National Park weather in June →Busy — Summer break in United States, school holidays in 2 of the markets that fill it
Nothing new starts in June.
Still on: Park highway opens (25 May – 31 Oct (usually))
July in Lassen Volcanic National Park
Lassen Volcanic National Park weather in July →Busy — Summer break in United States, school holidays in 2 of the markets that fill it
- Nature
Meadow wildflowers
1 Jul – 20 Aug · usuallyWildflowers & bloomsThe meadows below Kings Creek and along the Paradise Meadow trail come out within weeks of losing their snow, so the bloom runs late and short. The mosquitoes arrive on exactly the same schedule.
- Opening
Bumpass Hell boardwalk season
5 Jul – 15 Oct · usuallyTrail seasonThe trail into the biggest hydrothermal basin only opens once the snow is off the traverse, usually well into July. Stay on the boards — the crust over the boiling mud is thinner than it looks and people have gone through it. Source ↗
Still on: Park highway opens (25 May – 31 Oct (usually))
August in Lassen Volcanic National Park
Lassen Volcanic National Park weather in August →Busy — Summer break in United States, school holidays in 2 of the markets that fill it
- Hazard
Wildfire smoke season
1 Aug – 5 Oct · usuallyClosuresNorthern California's fire season lands squarely on the best walking weeks, and the Dixie Fire burned most of this park in 2021. Some late summers are clear and some close the road entirely. Source ↗
Still on: Park highway opens (25 May – 31 Oct (usually)), Meadow wildflowers (1 Jul – 20 Aug (usually)), Bumpass Hell boardwalk season (5 Jul – 15 Oct (usually))
September in Lassen Volcanic National Park
Lassen Volcanic National Park weather in September →Busy — Summer break in United States
Nothing new starts in September.
Still on: Park highway opens (25 May – 31 Oct (usually)), Bumpass Hell boardwalk season (5 Jul – 15 Oct (usually)), Wildfire smoke season (1 Aug – 5 Oct (usually))
October in Lassen Volcanic National Park
Lassen Volcanic National Park weather in October →Shoulder season — an ordinary month
Nothing new starts in October.
Still on: Park highway opens (25 May – 31 Oct (usually)), Bumpass Hell boardwalk season (5 Jul – 15 Oct (usually)), Wildfire smoke season (1 Aug – 5 Oct (usually))
November in Lassen Volcanic National Park
Lassen Volcanic National Park weather in November →Busy — Thanksgiving break in United States
Nothing new starts in November.
December in Lassen Volcanic National Park
Lassen Volcanic National Park weather in December →Busy — Winter / Christmas break in United States, school holidays in 2 of the markets that fill it
- Season
Winter at the southwest entrance
1 Dec – 14 MarOff-season shutdownClosuresThe highway is closed but the visitor centre at the southwest entrance stays open at weekends with a sledding hill beside it, and the north end has its own ploughed access. Everything in between is ski touring. Source ↗