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
|
|