Free
No entrance pass required
An entrance pass is not required to access Fort Union Trading Post National Historic Site. Other National Park Service sites may require an entrance pass or fee. Depending on your trip plans, an interagency pass may save you money. 2024 Free Entrance Days in the National ParksCome experience the national parks! All National Park Service sites that charge an entrance fee will offer free admission to everyone (other fees, including timed entry or reservation fees, may apply). Mark your calendar for these entrance fee-free dates:
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Last updated: May 22, 2023