| 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 |