Basic Information

Entrance Fees:



Park Hours

The site is open year round, Memorial Day until Labor Day, 8:00am to 6:30 pm daily, Labor Day through Memorial Day winter hours are 9:00am to 5:00pm, CDT.

The park operates on Central Daylight Standard Time.

Phone 701-572-9083

Access to site
Fort Union Trading Post sits on the Montana/North Dakota border, 25 miles southwest of Williston ND and 25 miles north of Sidney MT. The fort sits on the North Dakota side where the main parking lot is 1/4 mile on the Montana side. There is a slight climb in elevation when coming from the smaller parking lot which is about 500 feet from the fort.

Park grounds are mostly accessible to wheel chairs, but there are some stairs. A ramp to the Bourgeois House Visitor Center will be installed on request and parking lot shuttle service is available for visitors who have difficulty walking. Please have a member of your party contact the ranger at the Visitor Center desk. Video program includes closed captions and narration. A hands-on exhibit of animal pelts is available.

Plan ahead! Due to the ever expanding oil activity and housing shortage in our region hotels and RV camping spots should be reserved ahead of time. Williston, ND Hotels and Camping grounds and .Sidney, MT Hotels and Campgrounds There is no camping or overnight parking available on site. Primitive camping is available at Fort Buford State Historic Site, located 2 miles east of Fort Union.

Seasonal precautions

Weather in western North Dakota can be harsh, with extremes in temperature and sudden, violent storms. Be prepared for rapidly changing conditions.

Summers are warm with average high temperatures in the 80s-90s May through September. Winters are cold with average lows in the single digits December through February. Wind is considerable year-round. Conditions can change quickly.

Travelers should be aware of the potential for violent thunderstorms in the summer and the possibility of blizzard conditions in the winter.

Mosquitoes are also a seasonal problem, usually from mid-June to early August. Be sure and bring bug repellent and protect yourself accordingly.


There are no concessions on site, during special events limited concessions are available only. Restaurants and a grocery store are available in Fairview, MT, about 15 miles to the southwest of Fort Union.

Last updated: March 9, 2018

Contact the Park

Mailing Address:

15550 Highway 1804
Williston, ND 58801


(701) 572-9083

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