How Crowded Is Whitman Mission National Historic Site in May?

May runs about 1.7× Whitman Mission National Historic Site's average month, which makes it a very busy month here — roughly 14% of the park's yearly visitors come in May.

In a typical May the park sees roughly 7,000 recreation visits, based on National Park Service monthly counts from 1979 to 2025.

It is the single busiest month of the year at Whitman Mission; December, the quietest, runs only about 0.3× the average — a 5-to-1 swing between high and low season.

On our Best Time to Visit score May rates 44/100 ("Poor"), versus the top-rated August at 71/100 — pleasant weather with noticeably thinner crowds (shoulder season).

Typical May weather, from 1991–2020 NOAA climate normals at the nearest station, averages a daytime high near 73°F and an overnight low around 44°F, with about 1.8" of precipitation.

That average of about 58°F is a comfortable range for hiking and being outdoors all day.

Because June, July and August together draw about 33% of annual visitors, choosing May instead steps outside that summer crush — the single biggest lever on how crowded the park feels.

You'll have about 14.8 hours of daylight in May to explore — between the 8.5-hour midwinter low and the 15.5-hour summer high.

Park-wide, 2025 drew 54,089 recreation visits, down 11.8% from 61,331 in 2024.

Across the past decade overall visitation has risen about 12.1%, so a May visit is likely to feel busier than it did a few years ago.