What plant hardiness zone is Smooth Rock Falls

Smooth Rock Falls is located at Cochrane District, Ontario (ON), Canada.

Plant hardiness zone (winter frost zone or gardening zone) for Smooth Rock Falls is 2b by the PHZ Canadian scale.

Also perennial plants from the equivalent USDA zone 1b with coldest winter temperature −48.3 … −45.6 °C and lower can be grown here.

Smooth Rock Falls, Ontario @ wikipedia.