Best Time to Visit Lassen Volcanic National Park
The best months to visit Lassen Volcanic National Park are August, September and October — computed from official NPS visitation (2021–2025 average), NOAA weather normals and daylight. July is the crowd peak (107,728 monthly visits); December is quietest at 6% of peak.
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Monthly crowd curve
Average monthly recreation visits, 2021–2025 (NPS Visitor Use Statistics). Amber bar = current month.
Lassen Volcanic month by month
| Month | Verdict | Avg visits | % of peak | High / Low | Precip | Daylight |
|---|---|---|---|---|---|---|
| January | Shoulder | 8,093 | 8% | 41°F / 22°F | 6.5″ | 9.6h |
| February | Shoulder | 7,160 | 7% | 42°F / 22°F | 5.5″ | 10.7h |
| March | Shoulder | 6,998 | 6% | 46°F / 24°F | 6.4″ | 11.9h |
| April | Shoulder | 11,344 | 11% | 50°F / 28°F | 4.3″ | 13.3h |
| May | Shoulder | 33,897 | 31% | 61°F / 35°F | 2.9″ | 14.4h |
| June | Peak crowds | 77,194 | 72% | 70°F / 41°F | 1.3″ | 15.1h |
| July | Peak crowds | 107,728 | 100% | 79°F / 46°F | 0.3″ | 14.8h |
| August | Best window | 60,701 | 56% | 78°F / 45°F | 0.3″ | 13.8h |
| September | Best window | 50,271 | 47% | 72°F / 41°F | 0.7″ | 12.5h |
| October | Best window | 37,677 | 35% | 59°F / 33°F | 2.7″ | 11.2h |
| November | Shoulder | 9,727 | 9% | 47°F / 26°F | 4.7″ | 10h |
| December | Harsh season | 6,677 | 6% | 40°F / 22°F | 6.5″ | 9.3h |
Crowds: NPS Visitor Use Statistics, mean of 2021–2025 (2020 excluded as a COVID-19 anomaly). Weather: NOAA 1991–2020 monthly normals, station MANZANITA LAKE, CA US (8 mi from park coordinates). Daylight: computed for the 15th of each month at the park's location. Methodology.
How many people visit Lassen Volcanic each year
Lassen Volcanic National Park had 504,777 recreation visits in 2025, 41% more than 2024 (NPS Visitor Use Statistics). The busiest year since 2015 was 2020, with 542,274. Over 2021–2025 it averaged 417,467 visits a year, which makes it the 20th least-visited of the 63 national parks.
| Year | Recreation visits | vs. year before |
|---|---|---|
| 2025 | 504,777 | +41% |
| 2024 | 357,651 | −15% |
| 2023 | 418,978 | −6% |
| 2022 | 446,291 | +24% |
| 2021 | 359,635 | −34% |
| 2020 | 542,274 | +5% |
| 2019 | 517,039 | +4% |
| 2018 | 499,435 | −2% |
| 2017 | 507,256 | −5% |
| 2016 | 536,068 | +15% |
| 2015 | 468,092 | — |
Calendar-year recreation visits as published by NPS Visitor Use Statistics. 2020 is shown here but left out of the monthly averages above, because the COVID-19 pandemic makes it unrepresentative. See how every park compares: all 63 parks ranked by visits.
What to pack for Lassen Volcanic in August
Computed from August's weather normals — Lassen Volcanic's best month above. Visiting another month? Each month page has its own weather-computed list.
- Warm mid-layer (fleece or light puffy) — mornings average 45°F
- Sturdy broken-in footwear, navigation and a basic first-aid kit — every park, every month
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Common questions
What is the best month to visit Lassen Volcanic?
August, September and October rank best for Lassen Volcanic on VisitWhen's computed score — the strongest balance of low crowds (NPS data), comfortable weather (NOAA normals) and daylight, among months when the park’s headline access is typically open.
What is the most crowded month at Lassen Volcanic?
July: an average of 107,728 recreation visits (NPS, 2021–2025). The quietest is December, at 6% of the July peak.
When is Lassen Volcanic least crowded with decent conditions?
October, at 35% of the July peak (37,677 average visits). December is quieter still, but headline access is typically closed then.
How many people visit Lassen Volcanic per year?
Lassen Volcanic National Park had 504,777 recreation visits in 2025, 41% more than 2024 (NPS Visitor Use Statistics). The busiest year since 2015 was 2020, with 542,274. Over 2021–2025 it averaged 417,467 visits a year.
What is the weather like at Lassen Volcanic through the year?
The warmest month is July, with average highs of 79°F. The coldest nights come in February, averaging 22°F. The wettest month is January, with 6.5″ of precipitation. (NOAA 1991–2020 normals, MANZANITA LAKE, CA US station.)
Is Lassen Volcanic open all year?
The main park highway is typically closed by snow from November until June (sometimes July after big snow years). Dates shift with snow and weather each year, so check the park's current NPS conditions before you go.
Dive into a month
Comparing parks for the same trip? See how Lassen Volcanic ranks against all 63 parks in August, September and October.
Last verified 2026-09-24 · all parks