USDA 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