| Answer: The USDA (United States Department of Agriculture) has created a zoned map of north America identifying average minimum temperatures per region.
This is used to help us determine whether a plant can survive the coldest temperatures in a particular area.
If you live outside North America but want to know the definition of the hardy zones use the table below:
Zone 1: below -46 C (below -50 F)
Zone 2: -46 to -40 C (-50 to -40 F)
Zone 3: -40 to -34 C (-40 to -30 F)
Zone 4: -34 to -29 C (-30 to -20 F)
Zone 5: -29 to -23 C (-20 to -10 F)
Zone 6: -23 to -18 C (-10 to 0 F)
Zone 7: -18 to -12 C (0 to 10 F)
Zone 8: -12 to -7 C (10 to 20 F)
Zone 9: -7 to -1 C (20 to 30 F)
Zone 10: -1 to 4 C (30 to 40 F)
Zone 11: above 4 C (above 40 F)
You can read more about the USDA Hardy zones on the United States National Arboretum website, as well as on numerous other sites - just do a search on "USDA hardy zones map".
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