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.