What plant hardiness zone is Fort Simpson

Fort Simpson is located at Dehcho Region, Northwest Territories (NT), Canada.

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

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

Fort Simpson, Northwest Territories @ wikipedia.