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