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Approximate range of average annual minimum temperatures for each zone.

Degrees F	Zone	Degrees C
Below -50	Zone 1	Below -45
-50 to -40	Zone 2	-45 to -40
-40 to -30	Zone 3	-40 to -34.5
-30 to -20	Zone 4	-34.4 to -28.9
-20 to -10	Zone 5	-28.8 to -23.4
-10 to 0	Zone 6	-23.3 to -17.8
0 to +10	Zone 7	-17.7 to -12.3
10 to 20	Zone 8	-12.2 to -6.7
20 to 30	Zone 9	-6.6 to -1.2
30 to 40	Zone 10	-1.1 to +4.4