PLANT HARDINESS

ZONES

Also known as planting zones or growing zones—help gardeners understand

which plants can survive their region’s climate.

Find out which planting zone you’re located in and grow the best garden possible!

When choosing plants for your garden, it’s important to select varieties that can thrive year-round in your area, especially in regions where extreme winter temperatures are normal. Planting zones define, generally, which plants you can grow in your area, and zones are typically listed in 

plant growing guides for reference.

The two most commonly referenced hardiness zone maps are those produced by the U.S. Department of Agriculture and Natural Resources Canada. Different measures are used to create each country’s map, as is explained below.

Note: Zone maps are not absolute; if you find the information contradictory to your own experience, you may live in a microclimate

Soil, moisture, humidity, heat, wind, and other conditions also affect the viability of individual plants.

NRC CANADIAN PLANTING ZONES MAP

Unlike the USDA map, which is based only on minimum winter temperatures, the planting zones map produced by Natural Resources Canada considers a wider range of climatic variables, including maximum temperatures and the length of the frost-free period. However, the NRC also produce a map that shows plant hardiness zones for Canada based on the USDA extreme minimum temperature approach. 

Click here to see both Canadian planting zone maps.

Go to the Natural Resources Canada website to find out which zone you live in!

USDA PLANTING ZONES MAP

Considered the standard measure of plant hardiness, the USDA Plant Hardiness Zone Map is based on average annual minimum winter temperatures. The map is divided into thirteen distinct 10ºF zones, which are further divided into sub-zones of 5°F.

Go to the USDAwebsite to find out which zone you live in!

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