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USDA Plant Hardiness Zone Map

South-West US

Arizona, California, Nevada, Utah

Check the color of the section in your area of the map with the color key below.

Zones 5b through 10b represented here.   

South-West region Hardiness Zone Map Zone Color Key

USDA Hardiness Zones and Average Annual Minimum Temperature Range

  Zone  

  Fahrenheit  

    Celsius    

  Example Cities  

1

 Below -50 F  

Below -45.6 C

 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;   Victorville, 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