The table provided here is a guide to the zone designations listed in this catalog. To access more detailed information and specific geographic locations, go to the following internet site:


Then choose the link "USDA Plant Hardiness Zone Map". You will find information for the United States, Canada, and Mexico.

Zone Temperature in Degrees F(C)
1 below -50F (-45.6C)
2 -40 to -50F (-40.0 to -45.5C)
3 -30 to -40F (-34.5 to -39.9C)
4 -20 to -30F (-28.9 to -34.4C)
5 -10 to -20F (-23.4 to -28.8C)
6 -0 to -10F (-17.8 to -23.3C)
7 10 to 0F (-12.3 to -17.7C)

Data from 1998 US National Arboretum (Web Version) of the USDA Plant Hardiness Zone Map, USDA Miscellaneous Publication No. 1475, issued January 1990.