Plant Hardiness Zone Details Plant Hardiness Zone Details

Hardiness Zones and Average Annual Minimum Temperature Range

Zone    Temperature Range Example Cities 
          1    Below -50 F  (below -45.6C) Fairbanks, Alaska  
Resolute, Northwest Territories (Canada) 
        2a  -50 to -45 F  (-42.8 to -45.5 C)  Prudhoe Bay, Alaska  
Flin Flon, Manitoba (Canada) 
        2b   -45 to -40 F  (-40.0 to -42.7 C)  Unalakleet, Alaska  
Pinecreek, Minnesota 
        3a   -40 to -35 F  (-37.3 to -39.9 C)  International Falls, Minnesota   
St. Michael, Alaska
        3b   -35 to -30 F  (-34.5 to -37.2 C)  Tomahawk, Wisconsin  
Sidney, Montana
        4a  -30 to -25 F  (-31.7 to -34.4 C)  Minneapolis/St.Paul, Minnesota   
Lewistown, Montana
        4b   -25 to -20 F  (-28.9 to -31.6 C)  Northwood, Iowa  
Nebraska
        5a   -20 to -15 F (-26.2 to -28.8 C)  Des Moines, Iowa  
Illinois
        5b   -15 to -10 F(-23.4 to -26.1 C)  Columbia, Missouri  
Mansfield, Pennsylvania
        6a   -10 to -5 F(-20.6 to -23.3 C)  St. Louis, Missouri  
Lebanon, Pennsylvania
        6b   -5 to 0 F (-17.8 to -20.5 C)  McMinnville, Tennessee 
Branson, Missouri 
        7a   0 to 5 F (-15.0 to -17.7 C)  Oklahoma City, Oklahoma  
South Boston, Virginia
        7b   5 to 10 F (-12.3 to -14.9 C)  Little Rock, Arkansas 
Griffin, Georgia
        8a  10 to 15 F (-9.5 to -12.2 C)  Tifton, Georgia 
Dallas, Texas 
        8b  15 to 20 F (-6.7 to -9.4 C)  Austin, Texas  
Gainesville, Florida
        9a  20 to 25 F (-3.9 to -6.6 C)  Houston, Texas  
St. Augustine, Florida
        9b   25 to 30 F (-1.2 to -3.8 C)  Brownsville, Texas  
Fort Pierce, Florida
       10a   30 to 35 F (1.6 to -1.1 C)  Naples, Florida 
Barstow, California
       10b  35 to 40 F (4.4 to 1.7 C)  Miami, Florida 
Coral Gables, Florida
        11   above 40 F (above 4.5 C)  Honolulu, Hawaii 
Mazatlan, Mexico
 

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