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Plant Hardiness Zones

Key
USDA Hardiness Zones and
Average Annual Minimum Temperature Range
 
(Back to Map)

 USDA 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

USDA Hardiness Zone Map (clickable by region -U.S. National Arboretum)

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