Best Time to Visit Lassen Volcanic National Park
Crowds and weather by month · California · NPS visitor counts through 2025
The short answer
Mild weather, fewer people: October — 40% as busy as July, about 1,567 visitors a day, average high 59°F (15°C).
Quietest month: December — about 232 visitors a day, average high 40°F (cold).
Busiest month: July — about 3,881 visitors a day.
Lassen Volcanic month by month
| Month | Crowds · visitors/day | High / low · precip. |
|---|---|---|
| January× Cool | Very quiet7% of peak · 274/day | 41° / 22°F5° / -6°C · 6.5 in |
| February× Cool | Very quiet7% of peak · 277/day | 42° / 22°F5° / -6°C · 5.5 in |
| March× Cool | Very quiet6% of peak · 242/day | 46° / 24°F8° / -4°C · 6.4 in |
| April× Cool | Very quiet9% of peak · 338/day | 50° / 28°F10° / -2°C · 4.3 in |
| May△ Very few visitors — check what is open | Quiet26% of peak · 1,002/day | 61° / 35°F16° / 2°C · 2.9 in |
| June○ Mild weather, busy | Busy68% of peak · 2,648/day | 70° / 41°F21° / 5°C · 1.3 in |
| July○ Mild weather, busy | Peak100% of peak · 3,881/day | 79° / 46°F26° / 8°C · 0.3 in |
| August○ Mild weather, busy | Busy84% of peak · 3,242/day | 78° / 45°F26° / 7°C · 0.3 in |
| September○ Mild weather, busy | Busy63% of peak · 2,441/day | 72° / 41°F22° / 5°C · 0.7 in |
| OctoberBest◎ Mild weather, fewer people | Moderate40% of peak · 1,567/day | 59° / 33°F15° / 1°C · 2.7 in |
| November× Cool | Very quiet9% of peak · 349/day | 47° / 26°F8° / -3°C · 4.7 in |
| DecemberQuietest× Cold | Very quiet6% of peak · 232/day | 40° / 22°F4° / -6°C · 6.5 in |
Crowds = visitors per day as % of the busiest month: ●●●●● Peak (85–100) · ●●●●○ Busy (60–84) · ●●●○○ Moderate (35–59) · ●●○○○ Quiet (15–34) · ●○○○○ Very quiet (under 15). ◎ mild weather, fewer people · ○ mild but busy · △ very few visitors (often seasonal closures) · × cold or hot. Wet days = days with at least 0.1 in of rain or melted snow.
Visitors per year
| Year | Recreation visits | |
|---|---|---|
| 2015 | 468,092 | |
| 2016 | 536,068 | |
| 2017 | 507,256 | |
| 2018 | 499,435 | |
| 2019 | 517,039 | |
| 2020pandemic | 542,274 | |
| 2021pandemic | 359,635 | |
| 2022 | 446,291 | |
| 2023 | 418,978 | |
| 2024 | 357,651 | |
| 2025 | 504,777 |
Where the weather numbers come from
Temperatures and precipitation are 30-year averages (1991–2020) from the NOAA station MANZANITA LAKE — Manzanita Lake (northwest entrance), at 5,751 ft (1,753 m). Higher viewpoints and trails can be much colder and snowier than the station.
Months with very few visitors often have roads, campgrounds or visitor centers closed for the season. Check current conditions on the official Lassen Volcanic National Park website before you go.
Other parks at their best in October
- Grand Canyon
83% of peak · high 65°F
- Sequoia
55% of peak · high 59°F
- Joshua Tree
52% of peak · high 85°F
- Big Bend
51% of peak · high 80°F
- Grand Teton
35% of peak · high 56°F
- Bryce Canyon
71% of peak · high 58°F
How “best” is chosen: the least crowded month with an average high between 55°F and 85°F (13–29°C), skipping months with under 30% of peak visitors because those are often seasonal closures. Crowds compare visitors per day, so short and long months are treated fairly.
Sources. Visitor counts: National Park Service, Visitor Use Statistics (recreation visits, final figures through 2025; typical months use 2022–2025). Weather: NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020 (station MANZANITA LAKE, USC00045311, 5,751 ft / 1,753 m). Both are U.S. Government works in the public domain. How we calculate.
Park Months is an independent site and is not affiliated with the National Park Service or NOAA.