Alaska Hardiness Zones

 

Zones

Temperature Range 

Example Cities

1

Below -50 F (-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 (4.5 C)

Honolulu,Hawaii
Mazatlan,Mexico