What plant hardiness zone is Lethbridge

Lethbridge is located at Lethbridge County, Alberta (AB), Canada.

Plant hardiness zone (winter frost zone or gardening zone) for Lethbridge is 4b by the PHZ Canadian scale.

Plants of 4b PHZ hardiness zone suitable for outdoor gardening and growing in this winter frost zone 4b PHZ.

Also perennial plants from the equivalent USDA zone 3b with coldest winter temperature −37.2 … −34.4 °C and lower can be grown here, see list of plants for 3b USDA winter zone.

Lethbridge, Alberta @ wikipedia.