How Crowded Is Whitman Mission in May?
May is a very busy month at Whitman Mission National Historic Site, running about 1.7× the park's average month — roughly 14% of the year's visitors come in May. It is in fact the busiest month of the year here, so expect full parking lots, busy trails and booked-out campgrounds. If crowds bother you, December (the quietest month) or the recommended August are easier. Typical May weather averages a high near 73°F and a low around 44°F, with about 1.8" of precipitation. You'll get about 14.8 hours of daylight to explore.
Frequently Asked Questions
May is very busy at Whitman Mission National Historic Site (about 1.7× the average month). Our best-time score rates it "Poor". The single best month overall is August.
The busiest month is May and the quietest is December. May sits at about 1.7× the park's average, or 14% of annual visitation.
Source: National Park Service Visitor Use Statistics (1979–2025), NOAA NCEI Climate Normals 1991–2020. Updated 2026-06-20.