USDA Zones
1
2a
2b
3a
3b
4a
4b
5a
5b
6a
6b
7a
7b
8a
8b
9a
9b
10a
10b
11
Fahrenheit
Below -50 F
-50 to -45 F
-45 to -40 F
-40 to -35 F
-35 to -30 F
-30 to -25 F
-25 to -20 F
-20 to -15 F
-15 to -10 F
-10 to -5 F
-5 to 0 F
0 to 5 F
5 to 10 F
10 to 15 F
15 to 20 F
20 to 25 F
25 to 30 F
30 to 35 F
35 to 40 F
above 40 F
Celsius
Below 45.6 C
-42.8 to -45.5 C
-40.0 to -42.7 C
-37.3 to -39.9 C
-34.5 to -37.2 C
-31.7 to -34.4 C
-28.9 to -31.6 C
-26.2 to -28.8 C
-23.4 to -26.1 C
-20.6 to -23.3 C
-17.8 to -20.5 C
-15.0 to -17.7 C
-12.3 to -14.9 C
-9.5 to -12.2 C
-6.7 to -9.4 C
-3.9 to -6.6 C
-1.2 to -3.8 C
1.6 to -1.1 C
4.4 to 1.7 C
Above 4.5 C
USDA Hardiness Zones refer to the lowest average temperatures expected in their regions.