The Vegetable Garden

Planting Zones Details

    Planting Zones -- Details
    Zone Color Key

    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.

    USDA Hardiness Zones and Average Annual Minimum Temperature Range

     

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    Zone Fahrenheit Celsius Example Cities
    1 Below -50 F Below -45.6 C Fairbanks, Alaska; Resolute, Northwest Territories (Canada)
    2a -50 to -45 F -42.8 to -45.5 C Prudhoe Bay, Alaska; Flin Flon, Manitoba (Canada)
    2b -45 to -40 F -40.0 to -42.7 C Unalakleet, Alaska; Pinecreek, Minnesota
    3a -40 to -35 F -37.3 to -39.9 C International Falls, Minnesota; St. Michael, Alaska
    3b -35 to -30 F -34.5 to -37.2 C Tomahawk, Wisconsin; Sidney, Montana
    4a -30 to -25 F -31.7 to -34.4 C Minneapolis/St.Paul, Minnesota; Lewistown, Montana
    4b -25 to -20 F -28.9 to -31.6 C Northwood, Iowa; Nebraska
    5a -20 to -15 F -26.2 to -28.8 C Des Moines, Iowa; Illinois
    5b -15 to -10 F -23.4 to -26.1 C Columbia, Missouri; Mansfield, Pennsylvania
    6a -10 to -5 F -20.6 to -23.3 C St. Louis, Missouri; Lebanon, Pennsylvania
    6b -5 to 0 F -17.8 to -20.5 C McMinnville, Tennessee; Branson, Missouri
    7a 0 to 5 F -15.0 to -17.7 C Oklahoma City, Oklahoma; South Boston, Virginia
    7b 5 to 10 F -12.3 to -14.9 C Little Rock, Arkansas; Griffin, Georgia
    8a 10 to 15 F -9.5 to -12.2 C Tifton, Georgia; Dallas, Texas
    8b 15 to 20 F -6.7 to -9.4 C Austin, Texas; Gainesville, Florida
    9a 20 to 25 F -3.9 to -6.6 C Houston, Texas; St. Augustine, Florida
    9b 25 to 30 F -1.2 to -3.8 C Brownsville, Texas; Fort Pierce, Florida
    10a 30 to 35 F 1.6 to -1.1 C Naples, Florida; Victorville, California
    10b 35 to 40 F 4.4 to 1.7 C Miami, Florida; Coral Gables, Florida
    11 above 40 F above 4.5 C Honolulu, Hawaii; Mazatlan, Mexico