USDA Plant Zone Map

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