How Crowded Is Lassen Volcanic National Park in September?

September runs about 1.8× Lassen Volcanic National Park's average month, which makes it a very busy month here — roughly 15% of the park's yearly visitors come in September.

In a typical September the park sees about 71,000 recreation visits, based on National Park Service monthly counts from 1979 to 2025.

That makes September the 3rd-busiest of the park's twelve months, sitting between the July peak (2.8×) and the February low (0.2×).

On our Best Time to Visit score September rates 54/100 ("Fair"), versus the top-rated May at 61/100 — best overall balance of crowds, weather and daylight.

Typical September weather, from 1991–2020 NOAA climate normals at the nearest station, averages a daytime high near 72°F and an overnight low around 41°F, with about 0.7" of precipitation.

That average of about 57°F is a comfortable range for hiking and being outdoors all day.

Because June, July and August together draw about 57% of annual visitors, choosing September instead steps outside that summer crush — the single biggest lever on how crowded the park feels.

You'll have about 12.3 hours of daylight in September to explore — between the 9.1-hour midwinter low and the 14.9-hour summer high.

Park-wide, 2025 drew 504,777 recreation visits, up 41.1% from 357,651 in 2024.

Across the past decade overall visitation has eased about 8.1%, so September may feel a touch quieter than it once did.