Fort Whoop-Up, Trading post and national historic site in Lethbridge County, Canada.

Fort Whoop-Up is a trading post and national historic site in Lethbridge County built as a replica of a late 1800s fort. The site displays exhibits about fur trade transactions, goods, and the daily conditions at this cross-border trading location.

The original trading post emerged in the 1860s as a center for fur commerce and illegal alcohol operations with local communities. The permanent structure built afterward records a period of intense border activity between Canada and the United States.

The fort's nickname likely came from traders saying they were going to "whoop it up," or from the whip-cracking used to move bull trains along the Whoop-Up Trail from Fort Benton. The trade flag reported as American was later adopted as Lethbridge's municipal flag. Summer re-enactments with local performers portray figures from the fort's history.

The site is open to visitors and offers guided tours as well as the option to explore independently. Comfortable clothing is recommended since you will move through reconstructed buildings and outdoor areas.

The replica in Indian Battle Park was built in 1967 as a centennial project, downstream from the original fort. The original site was 6 km south of the interpretive centre, at the junction of the Belly (Oldman) and St. Mary's rivers. The last traces of the original fort washed away in a flood in 1915.