Approximate Range of Average Annual Minimum Temperatures for Each Zone
Zone 1
Below -50
Zone 2
-50 to -40
Zone 3
-40 to -30
Zone 4
-30 to -20
Zone 5
-20 to -10
Zone 6
-10 to 0
Zone 7
0 to 10
Zone 8
10 to 20
Zone 9
20 to 30
Zone 10
30 to 40
