The 2012 version of the hardiness zone map is available on the USDA website. And yes, the map is changing. Louisville’s West End is now zone 7a. Clifton, and all points east, are zone 6b. Louisville used to be in hardiness zone 6b as of 1990. The hardiness zone map is based on average annual minimum temperatures. It will be interesting to see how a year like this year will affect future maps…
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