A hardiness zone is a geographic area defined to encompass a certain range of climatic conditions relevant to plant growth and survival. The original and most widely-used system, developed by the United States Department of Agriculture (USDA) as a rough guide for landscaping and gardening, defines 13 zones by annual extreme minimum temperature. Unless otherwise specified, "hardiness zone" or simply "zone" usually refers to the USDA scale. For example, a plant may be described as "hardy to zone 10": this means that the plant can withstand a minimum temperature of -1 C (30.2 F) to 3.9 C (39.0 F). Click the map to view your hardiness zone.

To locate your zone by zip code, visit the USDA zone finder. 

~Source: https://en.wikipedia.org/wiki/Hardiness_zone

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