Climatic Zones  (Approximate lowest temperatures in the Winter.)

Zone 1           -50 degrees F (or lower)
Zone 2           -45 degrees F                                                                                                                                           
Zone 3          -40 degrees F
Zone 4          -35 degrees F
Zone 5          -25 degrees F
Zone 6          -15 degrees F
Zone 7           10 degrees F
Zone 8             0 degrees F
Zone 9           20 degrees F
Zone 10         28 degrees F