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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.

Zone

Fahrenheit

Celsius

Example Locations

1
Below -50° F
Below -45.6° C
Fairbanks, Alaska; Resolute, Northwest Territories (Canada)
2
-50° to -40° F
-45.5° to -40.0° C
Prudhoe Bay, Alaska; Flin Flon, Manitoba (Canada); Unalakleet, Alaska; Pinecreek, Minnesota
3
-40° to -30° F
-39.9° to -34.5° C
International Falls, Minnesota; St. Michael, Alaska; Tomahawk, Wisconsin; Sidney, Montana
4
-30° to -20° F
-34.4° to -28.9° C
Minneapolis/St.Paul, Minnesota; Lewistown, Montana; Northwood, Iowa; Nebraska
5
-20° to -10° F
-28.8° to -23.4° C
Des Moines, Iowa; Illinois; Columbia, Missouri; Mansfield, Pennsylvania
6
-10° to 0° F
-23.3° to -17.8° C
St. Louis, Missouri; Lebanon, Pennsylvania; McMinnville, Tennessee; Branson, Missouri
7
0° to 10° F
-17.7° to -12.3° C
Oklahoma City, Oklahoma; South Boston, Virginia; Little Rock, Arkansas; Griffin, Georgia
8
10° to 20° F
-12.2° to -6.7° C
Tifton, Georgia; Dallas, Texas; Austin, Texas; Gainesville, Florida
9
20° to 30° F
-6.6° to -1.2° C
Houston, Texas; St. Augustine, Florida; Brownsville, Texas; Fort Pierce, Florida
10
30° to 40° F
-1.1° to 4.4° C
Naples, Florida; Victorville, California; Miami, Florida; Coral Gables, Florida
11
above 40° F
above 4.5° C
Honolulu, Hawaii; Mazatlan, Mexico

 

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