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Understanding USDA Plant Hardiness ZonesHardiness Zones 101 The USDA Plant Hardiness Zone Map consists of 13 individual zones that take in all of the contiguous United States, plus Alaska, Hawaii, and Puerto Rico. The first zone lies at ...
Zones 1-6 are the coldest, and 7-13 the warmest. Zone 1 averages -60 degrees F while zone 13 never drops below 70 degrees F.
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