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USDA Hardiness Map
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Average Low Temperatures
Zone 4 
-30°F to -20°F
Zone 5 
-20°F to -10°F
Zone 6 
-10°F to 0°F
Zone 7 
-0°F to 10°F
Zone 8 
-10°F to 20°F
Map courtesy Boise Matthews, GoAmericanWest.com
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