How Crowded Is Manhattan Project in April?
April is an average month at Manhattan Project National Historical Park, running about 1.1× the park's average month — roughly 9% of the year's visitors come in April. That puts it between the July peak and the January low. Overall our best-time score rates April as "Poor" for a visit. Typical April weather averages a high near 61°F and a low around 35°F, with about 0.9" of precipitation and roughly 3.3" of snow. You'll get about 12.9 hours of daylight to explore.
Frequently Asked Questions
April is average at Manhattan Project National Historical Park (about 1.1× the average month). Our best-time score rates it "Poor". The single best month overall is May.
The busiest month is July and the quietest is January. April sits at about 1.1× the park's average, or 9% of annual visitation.
Source: National Park Service Visitor Use Statistics (2016–2025), NOAA NCEI Climate Normals 1991–2020. Updated 2026-06-20.