Free tool
USDA zone finder
Enter your US zip code to find your hardiness zone and discover what it means for your plants.
USDA hardiness zone scale (1a coldest – 13b warmest)
Your zone appears here
Enter a 5-digit US zip code and press Find My Zone.
Your USDA hardiness zone
Average annual extreme minimum temperature
°F to °F (°C to °C)
About zone
Why this matters for indoor plants
USDA zones mainly apply to outdoor gardening, but knowing your zone helps with indoor plant care too:
Each zip code is assigned a single zone, but conditions can vary within a zip code area (elevation, urban heat, local microclimates). For a precise location, use the official USDA Plant Hardiness Zone Map.
Source: USDA Plant Hardiness Zone Map 2023, PRISM Climate Group, Oregon State University.
How it works
What the tool does
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Enter a 5-digit US ZIP code.
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The tool looks the code up in the 2023 USDA Plant Hardiness Zone Map ZIP-code data (PRISM Climate Group, Oregon State University) and shows its zone, such as 7a, with that zone's temperature range in °F and °C.
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It then explains what the zone means and adds indoor care tips and a few houseplant suggestions for that climate.
Source: USDA Plant Hardiness Zone Map
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