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A geographic classification based on the average annual minimum winter temperature. The USDA Plant Hardiness Zone Map divides North America into zones numbered 1 through 13, each subdivided into “a” and “b” halves. A plant’s hardiness zone rating indicates the coldest zone in which it can survive winter.
@misc{emsenn2026-hardiness-zone,
author = {emsenn},
title = {hardiness zone},
year = {2026},
url = {https://emsenn.net/library/domesticity/domains/gardening/terms/hardiness-zone/},
publisher = {emsenn.net},
license = {CC BY-SA 4.0}
}