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USDA Plant Hardiness Zone lookup. US zip codes only.
enter your zip code and we'll tell you what to plant right now.
USDA Plant Hardiness Zone lookup. US zip codes only.
A USDA Plant Hardiness Zone is a region defined by its average annual minimum winter temperature. The United States Department of Agriculture divides the country into zones numbered from 1 (coldest) to 13 (warmest), and each zone is split into an "a" and "b" half in 5 degree steps. Your zone tells you which plants can survive your winters and, just as usefully, when your growing season starts and ends. Gardeners use the hardiness zone as the starting point for nearly every planting decision: what to grow, when to sow it, and how long the season will last before the first frost returns.
The fastest way to find your zone is by zip code. Because temperature patterns track closely with geography, your zip code maps to a specific USDA hardiness zone. Enter your 5-digit zip above and we look it up instantly, then hand you the typical last frost date, first frost date, and the number of growing days you can count on. No account, no email, and it works entirely in your browser.
Knowing your zone turns a guess into a plan. It sets your frost dates, which set your sowing calendar: when to start tomatoes indoors, when it's finally safe to direct sow beans outdoors, and when to squeeze in a fall crop of lettuce before the cold. Plant too early and a frost takes it. Plant too late and it never finishes. Your zone, paired with the current month, tells you exactly what to plant right now, which is precisely what the guide on the next screen lays out for you.