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Cold Hardiness Zones and Average Annual Minimum Temperature Range

Cold hardiness zones divide regions into zones based on minimum winter temperatures. The higher the number, the warmer the zone. Your trees and shrubs should be cold hardy in your climate -- which means they are able to withstand the lowest winter temperatures likely to occur in your climate. Otherwise they may freeze to death and leave an unwanted hole in your landscape. Refer to the table below for minimum winter temperature ranges in each zone.




Example Locations

Below -50° F
Below -45.6° C
Fairbanks, Alaska; Resolute, Northwest Territories (Canada)
-50° to -40° F
-45.5° to -40.0° C
Prudhoe Bay, Alaska; Flin Flon, Manitoba (Canada); Unalakleet, Alaska; Pinecreek, Minnesota
-40° to -30° F
-39.9° to -34.5° C
International Falls, Minnesota; St. Michael, Alaska; Tomahawk, Wisconsin; Sidney, Montana
-30° to -20° F
-34.4° to -28.9° C
Minneapolis/St.Paul, Minnesota; Lewistown, Montana; Northwood, Iowa; Nebraska
-20° to -10° F
-28.8° to -23.4° C
Des Moines, Iowa; Illinois; Columbia, Missouri; Mansfield, Pennsylvania
-10° to 0° F
-23.3° to -17.8° C
St. Louis, Missouri; Lebanon, Pennsylvania; McMinnville, Tennessee; Branson, Missouri
0° to 10° F
-17.7° to -12.3° C
Oklahoma City, Oklahoma; South Boston, Virginia; Little Rock, Arkansas; Griffin, Georgia
10° to 20° F
-12.2° to -6.7° C
Tifton, Georgia; Dallas, Texas; Austin, Texas; Gainesville, Florida
20° to 30° F
-6.6° to -1.2° C
Houston, Texas; St. Augustine, Florida; Brownsville, Texas; Fort Pierce, Florida
30° to 40° F
-1.1° to 4.4° C
Naples, Florida; Victorville, California; Miami, Florida; Coral Gables, Florida
above 40° F
above 4.5° C
Honolulu, Hawaii; Mazatlan, Mexico


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