USDA Plant Hardiness Zone Map


USDA Plant Hardiness Zone Map

This hyperlinked map from the USDA shows 10 different zones, each of which represents an area of winter hardiness for the plants of agriculture and our natural landscape. It also introduces Zone 11 to represent areas that have average annual minimum temperatures above 40 F (4.4 C) and that are therefore essentially frost free.

The map shows 20 latitude and longitude lines. Areas above an arbitrary elevation are traditionally considered unsuitable for plant cropping and do not bear appropriate zone designations. There also are island zones that, because of elevation differences, are warmer or cooler than the surrounding areas and are given a different zone designation.

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