Hardiness Zones · Interactive Map

Hardiness Zones of Canada

Hardiness zones are regions defined by the ability of plants to survive local climatic conditions. They are based on parameters such as the annual minimum temperature, the length of the growing season, and other environmental factors. Gardeners and nurserymen use these zones to determine which plants are best suited for their region.

What is a hardiness zone?

Plant hardiness refers to their ability to tolerate minimum winter temperatures. Hardiness zones in Canada are classified from 0a (the coldest) to 9a (the warmest). Plants suitable for a given zone can withstand typical winters in that region without suffering major damage.

How to use this map?

To determine if a plant is suitable for your region, you can refer to the hardiness zone map. The zones are defined based on local climatic conditions, and each zone corresponds to ranges of minimum winter temperatures. Be sure to choose plants compatible with your hardiness zone to maximize their chances of survival and growth.

Factors affecting plant hardiness

A plant's hardiness depends not only on minimum winter temperatures but also on other environmental factors, such as:

• Moisture: Precipitation and ambient moisture play a role in plant survival.
• Wind: Cold winds can damage plants, especially in exposed areas.
• Soil: Well-drained soils better protect roots from freezing temperatures.
• Altitude: Higher altitude regions are often colder, even in warmer hardiness zones.

Why is it important for your garden?

Knowing your region's hardiness zone allows you to make informed decisions for your plantings. Planting trees, shrubs, or perennials adapted to your climate ensures healthier and more resilient gardens. This way, you can avoid unpleasant surprises from winters that are too harsh for non-adapted plants.