USDA Plant Hardiness Zone Chart
The USDA plant hardiness zone is one guide to indicate a plant’s ability to withstand an average minimum temperature. However, other factors, including soil type, moisture, drainage, humidity and exposure to sun and wind can have a direct effect on the success of a plant’s survival. Use this as a guide, keeping the other factors in mind when deciding where and what to plant.
Zone1 Below -50F
Zone 2 -50F to -40F
Zone 3 -40F to -30F
Zone 4 -30F to -20F
Zone 5 -20F to -10F
Zone 6 -10F to 0F
Zone 7 0F to 10F
Zone 8 10F to 20F
Zone 9 20F to 30F
Zone 10 30F to 40F
Zone 11 Above 40F
Some zip codes are in small areas that are warmer or cooler than the surrounding area. These areas, called microclimates, are often associated with urbanization or steep elevation changes, and many are too small to show on our map.
If it looks on the map like your zip code should be in a different hardiness zone than the one we provide for you, your zip code is probably in a microclimate that is too small to represent on the map.
A good example of this is Chicago, Illinois. Several zip codes for the city of Chicago bring up zones 5-6.
Microclimates occur in most large cities due to the urbanization effect that buildings bring about. In addition, regions of the country with bodies of water or mountains may contain "pockets." These climatic pockets mirror warmer or cooler zones than the surrounding region.
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