Visitation · National Historic Site

Fort Union Trading Post National Historic Site visitation by month and year

June is the busiest month at Fort Union Trading Post, when the average temperature nearby is 64 degrees. December is the quietest, and the average temperature then is 18 degrees. An average June draws 3,768 visits where an average December draws 39. The crowd arrives with the warm weather and leaves with it. Annual visits fell 24.4 percent, from 12,967 in 2019 to 9,808 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 Williston Exp Farm, 17 miles from the park's reference point at 2,105 feet, station USC00329430 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, 1979 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	9,808	-18.5%
2024	12,028	-7.1%
2023	12,942	+0.9%
2022	12,822	+11.7%
2021	11,479	+119.7%
2020	5,225	-59.7%
2019	12,967	-4.3%
2018	13,551	+1.7%
2017	13,329	-23.8%
2016	17,502	+28.6%

Visitation at other parks

Yellowstone National Park Glacier National Park San Juan National Historic Site Fort Vancouver National Historic Site

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 USC00329430, 2,105 feet above sea level. Data refreshed October 14, 2026.