USDA Plant Hardiness Zone Map
Average Annual Extreme Minimum Temperature 1976 - 2005 Temp (F) Zone Temp (C)
1a 1b
-51.1 to -48.3 -48.3 to -45.6 -45.6 to -42.8 -42.8 to -40 -40 to -37.2 -37.2 to -34.4 -34.4 to -31.7 -31.7 to -28.9 -28.9 to -26.5 -26.1 to -23.3 -23.3 to -20.6 -20.6 to -17.8 -17.8 to -15 -15 to -12.2 -12.2 to -9.4 -9.4 to -6.7 -6.7 to -3.9 -3.9 to -1.1
-60 to -55 -55 to -50 -50 to -45 -45 to -40 -40 to -35 -35 to -30 -30 to -25 -25 to -20 -20 to -15 -15 to -10 -10 to -5 -5 to -0
2a 2b 3a 3b 4a 4b 5a 5b 6a 6b 7a 7b 8a 8b 9a 9b
-0 to 5 5 to 10
10 to 15 15 to 20 20 to 25 25 to 30 30 to 35 35 to 40 40 to 45 45 to 50 50 to 55 55 to 60 60 to 65 65 to 70
10a 10b 11a 11b 12a 12b 13a 13b
-1.1 to 1.7 1.7 to 4.4 4.4 to 7.2 7.2 to 10 10 to 12.8 12.8 to 15.6 15.6 to 18.3 18.3 to 21.1
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