USDA Zone Map
 
Find your Zone based on your Zip code provided by the National Arbor Day Foundation web site
The USDA hardiness zones are based the average annual minimum temperature that occurs in an area. Each Zone can have multiple micro climates. A good method to determine which plants do well in your zone is too observe the actual plants growing in the immediate area.
| 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 |
above information reprinted from USDA and trade sources. |
