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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
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