USDA hardiness zone finder by ZIP code
Enter your ZIP code. Get your 2023 USDA Plant Hardiness Zone, the average annual extreme minimum temperature for your area, and a curated list of plants that survive it.
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What the zone actually means
The USDA Plant Hardiness Zone Map divides North America into 13 zones based on the average annual extreme minimum temperature — the coldest single night your area typically experiences in a normal winter. Each zone covers a 10°F range; each half-zone (e.g. 7a vs 7b) covers 5°F.
A plant rated for zone 6 means it reliably survives winter lows down to -10°F. A plant rated for zone 9 will die the first time temperatures drop below 20°F. Plants in their hardy zone return year after year; plants beyond their hardy zone are effectively annuals.
The 2023 map (released November 2023) shifted about half of all U.S. ZIP codes into a warmer half-zone compared to the 2012 map — not because climate change shifted overnight, but because the new map uses a longer 30-year temperature dataset (1991-2020) and finer-resolution interpolation.
Data source: phzmapi.org · underlying USDA-ARS 2023 Plant Hardiness Zone Map at planthardiness.ars.usda.gov