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Fort Union Trading Post National Historic Site


  • Missouri River
  • National Historic Site
Fort Union Trading Post was the most important fur trading post on the upper Missouri from 1828 to 1867. Assiniboine, Crow, Cree, Ojibway, Blackfeet, Hidatsa, and other tribes peacefully traded buffalo robes and other furs for trade goods such as beads, guns, blankets, knives, cookware, and cloth from American Fur Company traders. The site is located near the mouth of the Yellowstone and Missouri river, on the Montana-North Dakota Border. Open daily.
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Street Address
Fort Union Trading Post
15550 Highway 1804
Williston, ND 58801
Sidney, ND
Mailing Address
15550 Highway 1804
Williston, ND 58801
All Year
Summer: 8:00am - 6:30pm central time Winter: 9:00am - 5:30pm
Special direction map

Special Directions

Fort Union is 15 miles SE of Bainville, Montana; 21 miles north of Sidney, Montana; 25 miles SW of Williston, North Dakota. The historic site sits astride the Montana/North Dakota state line, and on the north bank of the Missouri River.