USDA Hardiness Zone Map
Average Annual Minimum Temperature |
||
| Zone | Temperature ºC |
Temperature ºF |
| 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 |