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October 2008
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USDA Plant Hardiness Zone Map

Nearly every single plant, or seed requires a growing zone it will grow in. You read about different types of plants, and almost every good information site will provide the hardiness zones that it will grow in, but you don’t know which zone you are in. This map will provide this information to you, either by clicking on a zone in the map, or in the list of state abbreviations below the map.

Link to the site (opens in a new window).

How to Use the New Map:
Zones 2-10 in the map have been subdivided into light- and dark-colored sections (a and b) that represent 5 F (2.8 C) differences within the 10 F (5.6 C) zone. The light color of each zone represents the colder section; the dark color, the warmer section. Zone 11 represents any area where the average annual minimum temperature is above 40 F (4.4 C). The map shows 20 latitude and longitude lines. Areas above an arbitrary elevation are traditionally considered unsuitable for plant cropping and do not bear appropriate zone designations. There are also island zones that, because of elevation differences, are warmer or cooler than the surrounding areas and are given a different zone designation. Note that many large urban areas carry a warmer zone designation than the surrounding countryside. The map-contains as much detail as possible, considering the vast amount of data on which it is based and its size.

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