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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.