Visitation · National Historical Park

Manhattan Project National Historical Park visitation by month and year

July is the busiest month at Manhattan Project, when the average temperature nearby is 70 degrees. January is the quietest, and the average temperature then is 30 degrees. July runs about 5.4 times the visits of January. The crowd arrives with the warm weather and leaves with it. Annual visits fell 29.4 percent, from 79,870 in 2019 to 56,390 in 2025.

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Visits by month, with temperature and precipitation

Bars are the average recreation visits in each month over 2021 to 2025. The line is the average temperature at Los Alamos, 2 miles from the park's reference point at 7,424 feet, station USC00295084 in the NOAA 1991 to 2020 climate normals. The lower panel is monthly rain and snow from the same station, also 1991 to 2020 averages.

Annual visits, 2016 to 2025

Recreation visits per calendar year. A year with a missing month is left blank rather than estimated.

The last ten years

Year	Recreation visits	Change on prior year
2025	56,390	-24.5%
2024	74,693	+24.3%
2023	60,100	+120.4%
2022	27,265	+4.6%
2021	26,063	+128.8%
2020	11,392	-85.7%
2019	79,870	+14.8%
2018	69,543	-22.4%
2017	89,599	-14.4%
2016	104,715

Visitation at other parks

Great Smoky Mountains National Park Natchez Trace Parkway Chesapeake & Ohio Canal National Historical Park San Francisco Maritime National Historical Park

Source: NPS Visitor Use Statistics, monthly recreation visits, as compiled for Publicopia Labs. A year is shown only when all twelve months were reported. Temperature, precipitation and snowfall normals are the 1991 to 2020 monthly averages published by NOAA NCEI for station USC00295084, 7,424 feet above sea level. Data refreshed October 14, 2026.