| Hardiness Zone Chart |
|
Annual Minimum Temperature
|
| Zone |
Farenheit |
Centigrade |
Example Cities
|
| 1 |
below -50 F |
below -45.6 C |
Fairbanks, Alaska
Resolute, NW Territories (Canada) |
| 2a |
-50/-45 F |
-42.8/-45.5 C |
Prudhoe Bay, Alaska
Flin Flon, Manitoba |
| 2b |
-45/-40 F |
-42.7/-40.0 C |
Unalakleet, Alaska
Pinecreek, Minnesota |
| 3a |
-40/-35 F |
-40.0/-37.3 C |
International Falls, Minnesota
St. Michael, Alaska |
| 3b |
-35/-30 F |
-37.2/-34.5 C |
Tomahawk, Wisconsin
Sidney, Montana |
| 4a |
-30/-25 F |
-34.4/-31.7 C |
Minneapolis/St. Paul, Minnesota
Lewiston, Montana |
| 4b |
-25/-20 F |
-31.6/-28.9 C |
Northwood, Iowa
Nebraska |
| 5a |
-20/-15 F |
-28.8/-26.2 C |
Des Moines, Iowa
Illinois |
| 5b |
-15/-10 F |
-26.1/-23.4 C |
Columbia, Missouri
Mansfield, Pennsylvania |
| 6a |
-10/- 5 F |
-23.3/-20.6 C |
St. Louis, Missouri
Lebanon, Pennslyvania |
| 6b |
- 5/ 0 F |
-20.5/-17.8 C |
McMinnville, Tennessee
Branson, Missouri |
| 7a |
0/+ 5 F |
-17.7/-15.0 C |
Oklahoma City, Oklahoma
South Boston Virginia |
| 7b |
+ 5/+10 F |
-15.0/-12.3 C |
Little Rock Arkansas
Griffin, Georgia |
| 8a |
+10/+15 F |
-12.2/- 9.5 C |
Tifton, Georgia
Dallas, Texas |
| 8b |
+15/+20 F |
- 9.4/- 6.7 C |
Austin, Texas
Gainesville, Florida |
| 9a |
+20/+25 F |
- 6.6/- 3.9 C |
Houston, Texas
St. Augustine, Florida |
| 9b |
+25/+30 F |
- 3.8/- 1.2 C |
Brownsville, Texas, Phoenix AZ,
Fort Pierce, Florida |
| 10a |
+30/+35 F |
- 1.1/+ 1.6 C |
Naples, Florida
Barstow, California |
| 10b |
+35/+40 F |
+ 1.7/+ 4.4 C |
Miami, Florida
Coral Gables, Florida |
| 11 |
above +40 F |
above +4.5 C |
Honolulu, Hawaii
Mazatlan, Mexico |
