How Crowded Is Valles Caldera National Preserve in September?

September runs about 1.7× Valles Caldera National Preserve's average month, which makes it a very busy month here — roughly 14% of the park's yearly visitors come in September.

In a typical September the park sees roughly 9,800 recreation visits, based on National Park Service monthly counts from 2020 to 2025.

It is the single busiest month of the year at Valles Caldera; February, the quietest, runs only about 0.4× the average — a 4-to-1 swing between high and low season.

On our Best Time to Visit score September rates 30/100 ("Poor"), versus the top-rated June at 54/100 — 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 66°F and an overnight low around 36°F, with about 2.2" of precipitation.

That average of about 51°F is a comfortable range for hiking and being outdoors all day.

Because June, July and August together draw about 35% 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 12.2 hours of daylight in September to explore — between the 9.6-hour midwinter low and the 14.4-hour summer high.

Park-wide, 2025 drew 84,952 recreation visits, up 3.5% from 82,111 in 2024.

Across the past decade overall visitation has risen about 152%, so a September visit is likely to feel busier than it did a few years ago.