What plant hardiness zone is Yellowknife

Yellowknife is located at North Slave Region, Northwest Territories (NT), Canada.

Plant hardiness zone (winter frost zone or gardening zone) for Yellowknife is 0a 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.

Yellowknife, Northwest Territories @ wikipedia.