| USDA
Zone |
Temperature Range |
Example
Cities |
| 1 |
Below
-50 F
(-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
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 |
