Check the color of the section in your area of the map with the color key below.
|
USDA
Zone
|
Temperature Range
Fahrenheit
|
Temperature Range
Celsius
|
|
1
|
below
-50
|
below -45.6
|
|
2a
|
-50
to -45
|
-42.8 to -45.5
|
|
2b
|
-45
to -40
|
-40.0 to -42.7
|
|
3a
|
-40
to -35
|
-37.3 to -39.9
|
|
3b
|
-35
to -30
|
-34.5 to -37.2
|
|
4a
|
-30
to -25
|
-31.7 to -34.4
|
|
4b
|
-25
to -20
|
-28.9 to -31.6
|
|
5a
|
-20
to -15
|
-26.2 to -28.8
|
|
5b
|
-15
to -10
|
-23.4 to -26.1
|
|
6a
|
-10
to -5
|
-20.6 to -23.3
|
|
6b
|
-5
to 0
|
-17.8 to -20.5
|
|
7a
|
0
to 5
|
-15.0 to -17.7
|
|
7b
|
5
to 10
|
-12.3 to -14.9
|
|
8a
|
10
to 15
|
-9.5 to -12.2
|
|
8b
|
15
to 20
|
-6.7 to -9.4
|
|
9a
|
20
to 25
|
-3.9 to -6.6
|
|
9b
|
25
to 30
|
-1.2 to -3.8
|
|
10a
|
30
to 35
|
1.6 to -1.1 |
10b |
35 to 40 |
4.4 to 1.7 |
11 |
above 40 |
above 4.5 |
Source: http://www.ars-grin.gov/ars/Beltsville/na/hardzone/ushzmap.html
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