USDA Plant Hardiness zones (new for 2003):
http://www.colostate.edu/Depts/CoopE...den/zones2.htm
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Official Site for all of the US:
http://www.usna.usda.gov/Hardzone/ushzmap.html

Unfortunately, this last site still has the outdated zones. The USDA plant
hardiness zones, last updated in 1990, are about to be revised. Gone will be
the "a and b" zones. Four more numbered zones will be added for the
semitropical portion of the country for a total of 15 zones. The American
Horticultural Society has designed the new map. You can see it on a very
slow-loading PDF file on their site or in a smaller html version at the first
site mentioned. There are no longer a's or b's within zones, and the color
coding has been named for plants that are hardy in each zone. For an
explanation, see:
http://www.colostate.edu/Depts/CoopE...rden/zones.htm
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