What plant hardiness zone is Greenstone

Greenstone is located at Thunder Bay District, Ontario (ON), Canada.

Plant hardiness zone (winter frost zone or gardening zone) for Greenstone 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.

Greenstone, Ontario @ wikipedia.