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This is the 2003 US National Arboretum "Web Version" of the 1990 USDA Plant Hardiness Zone Map.
Check the color of the section in your area of the map with the color key below.
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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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USDA Hardiness Zones and Average Annual Minimum Temperature
Range
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1
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Below -50 F
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Below -45.6 C
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Fairbanks, Alaska; Resolute,
Northwest Territories (Canada) |
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2a
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-50 to -45 F
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-42.8 to -45.5 C
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Prudhoe Bay, Alaska; Flin Flon,
Manitoba (Canada) |
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2b
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-45 to -40 F
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-40.0 to -42.7 C
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Unalakleet, Alaska; Pinecreek,
Minnesota |
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3a
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-40 to -35 F
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-37.3 to -39.9 C
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International Falls, Minnesota; St.
Michael, Alaska |
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3b
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-35 to -30 F
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-34.5 to -37.2 C
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Tomahawk, Wisconsin; Sidney,
Montana |
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4a
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-30 to -25 F
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-31.7 to -34.4 C
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Minneapolis/St.Paul, Minnesota; Lewistown,
Montana |
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4b
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-25 to -20 F
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-28.9 to -31.6 C
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Northwood, Iowa; Nebraska |
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5a
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-20 to -15 F
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-26.2 to -28.8 C
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Des Moines, Iowa; Illinois |
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5b
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-15 to -10 F
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-23.4 to -26.1 C
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Columbia, Missouri; Mansfield,
Pennsylvania |
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6a
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-10 to -5 F
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-20.6 to -23.3 C
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St. Louis, Missouri; Lebanon, Pennsylvania |
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6b
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-5 to 0 F
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-17.8 to -20.5 C
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McMinnville, Tennessee; Branson,
Missouri |
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7a
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0 to 5 F
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-15.0 to -17.7 C
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Oklahoma City, Oklahoma; South
Boston, Virginia |
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7b
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5 to 10 F
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-12.3 to -14.9 C
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Little Rock, Arkansas; Griffin,
Georgia |
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8a
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10 to 15 F
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-9.5 to -12.2 C
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Tifton, Georgia; Dallas, Texas |
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8b
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15 to 20 F
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-6.7 to -9.4 C
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Austin, Texas; Gainesville,
Florida |
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9a
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20 to 25 F
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-3.9 to -6.6 C
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Houston, Texas; St. Augustine,
Florida |
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9b
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25 to 30 F
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-1.2 to -3.8 C
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Brownsville, Texas; Fort Pierce,
Florida |
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10a
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30 to 35 F
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1.6 to -1.1 C
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Naples, Florida; Victorville,
California |
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10b
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35 to 40 F
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4.4 to 1.7 C
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Miami, Florida; Coral Gables,
Florida |
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11
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above 40 F
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above 4.5 C
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Honolulu, Hawaii; Mazatlan,
Mexico |
USDA Miscellaneous Publication No. 1475. Issued January 1990.
Authored by Henry M. Cathey while Director, U.S. National Arboretum
Edited, formatted and prepared for the US National Arboretum website by Ramon Jordan, March 1998 and revised March 2001
U.S. National Arboretum, Agricultural Research Service, U.S. Department of
Agriculture, Washington, DC 20002
Note: This publication is not
copyrighted, and permission to reproduce all or any part of it is not required. |
