Hardiness Zone Map
Average Annual Minimum Temperature
Zone
Temperature °C
Temperature °F
1
-45.6 and below
below -50
2a
-42.8 to 45.5
-45 to -50
2b
-40.0 to -42.7
-40 to -45
3a
-37.3 to -40.0
-35 to -40
3b
-34.5 to -37.2
-30 to -35
4a
-31.7 to -34.4
-25 to -30
4b
-28.9 to -31.6
-20 to -25
5a
-26.2 to -28.8
-15 to -20
5b
-23.4 to -26.1
-10 to -15
6a
-20.6 to -23.3
-5 to -10
6b
-17.8 to -20.5
0 to -5
7a
-15.0 to -17.7
5 to 0
7b
-12.3 to -15.0
10 to 5
8a
-9.5 to -12.2
15 to 10
8b
-6.7 to -4.0
20 to 15
9a
-3.9 to -6.6
25 to 20
9b
-1.2 to -3.8
30 to 25
10a
1.6 to -1.1
35 to 30
10b
4.4 to 1.7
40 to 35
11
4.5 and above
40 and above
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