What plant hardiness zone is Fort Smith

Fort Smith is located at South Slave Region, Northwest Territories (NT), Canada.

Plant hardiness zone (winter frost zone or gardening zone) for Fort Smith is 1b by the PHZ Canadian scale.

Also perennial plants from the equivalent USDA zone 0b with coldest winter temperature −53.9 … −51.1 °C and lower can be grown here.

Fort Smith, Northwest Territories @ wikipedia.