What plant hardiness zone is Nahanni Butte

Nahanni Butte is located at Dehcho Region, Northwest Territories (NT), Canada.

Plant hardiness zone (winter frost zone or gardening zone) for Nahanni Butte 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.

Nahanni Butte, Northwest Territories @ wikipedia.