USDA HUMMINGBIRD PLANT
HARDINESS ZONES

Average Annual Minimum Temperature Range

A hyper-linked version of the United States Department of Agriculture's
Plant Hardiness Zone Map for all of North America
(Southeastern U.S., above) is available at the
Web site for the U.S. National Arboretum.

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)

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