Zone Hardiness

Calculate Your Zone

Enter your zip code in the search box below, then click the location dot to view more information and the zone.

The United States Department of Agriculture (USDA) has devised a system to provide gardeners with a basic guide to plant hardiness – how much winter cold a plant can withstand. The Hardiness Zone Map system divides the United States and Canada into numbered zones based on lowest average winter temperature. Even within a zone, different micro-climates exist, such as large urban areas which may be warmer or land situated at different elevations.

ZoneTemp (F)
1below -50
2-50 to -40
3-40 to -30
4-30 to -20
5-20 to -10
6-10 to 0
70 to 10
810 to 20
920 to 30
1030 to 40
11above 40
USDA growing zone map

What Affects Plant Hardiness?

The Hardiness Zone Map is a valuable tool but it is not foolproof. There are a variety of factors that can influence the hardiness of a given plant in a garden. These factors include: soil type, drainage, snow cover, exposure to wind, winter, rainfall (or lack of), as well as fluctuations in temperature.

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