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USDA Hardiness Zone Map
The USDA has released an updated Plant Hardiness Zone Map for the first time since 2012. This map is based on 30-year averages of lowest annual winter temperatures in specific locations with data collected from 13,412 weather stations vs. 7,983 that were used for the 2012 map.
The hardiness map indicates the average lowest temperature for an area, as opposed to the Heat Zone Map, which is put out by the American Horticultural Society and represents the average number of days above 86 F, annually.