USDA hardiness zones

Zone

Fahrenheit

Celsius

Example Cities

1

Below-50 F

Below -45.6 C

Fairbanks, Alaska; Resolute, Northwest Territories (Canada)

2a

-50 to -45F

-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