USDA Hardiness Zone Map

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

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