USDA Plant Hardiness Zone Lookup by ZIP Code 2023
Quickly and easily locate your hardiness zone. Ensure you have the correct zone by browsing the map for your location. All data is sourced from the official USDA Hardiness Zone dataset.
Hardiness Zone
Find your USDA hardiness zone
Enter a ZIP code or use your current location to view nearby hardiness zones on the map.
What is a Hardiness Zone?
- A USDA Plant Hardiness Zone classifies a location by its average annual extreme minimum winter temperature.
- Zones run from 1 (coldest) to 13 (warmest), each split into a and b half-zones of about 5°F.
- Your zone describes how cold winters typically get where you garden — nothing else.
Why know your Hardiness Zone?
- Choose perennial plants that can survive your coldest winter temperatures.
- Select trees, shrubs, vines, berries, and other long-lived plants suited to your winters.
What NOT to use Hardiness Zone for
- Choosing annual crops for spring and summer vegetable gardens.
- Predicting season length, planting dates, or first and last frost timing.
Hardiness zone FAQs
Yes. Many ZIP codes span enough elevation or terrain that more than one USDA hardiness zone appears inside the same code.
A single zone number for a ZIP is an average or centroid shortcut. Use the map on this page after you look up your ZIP or location to see how zones change nearby—not just one label for the whole code.
Hardiness zones follow extreme winter cold, which shifts with elevation, cold-air drainage, and local terrain—especially in the western U.S. and other hilly areas.
Your neighbor a mile away (or hundreds of feet higher or lower) can sit in a different half-zone. Treat your map result as the planning zone for your spot, not a street-wide constant.
Yes. Diggin Up uses the official USDA Plant Hardiness Zone dataset from the December 2023 map update, produced with USDA Agricultural Research Service and Oregon State University PRISM Climate Group data.
Older printed guides or websites may still show 2012 or 1990 zones; those can disagree with what you see here.
Each numbered zone spans about 10°F of average annual extreme minimum temperature and is split into “a” and “b” half-zones of about 5°F.
The “a” half is the colder side of that zone; the “b” half is the warmer side. Plant tags that list a range (for example 5–8) usually mean the plant is expected to survive winters in those zones.
Use your zone to screen perennials, trees, shrubs, vines, and other plants that must survive your coldest winters—match the coldest zone on the plant tag to yours or a colder one.
Zone alone does not tell you heat tolerance, soil, water, or when to plant annual vegetables; those need other tools and local knowledge.
Enter a ZIP code or use your current location to center the map and read the zone at that point.
Then pan and zoom to compare nearby areas—especially if your garden sits on a hillside, in a valley, or far from the ZIP centroid—so you are not relying on a single number for a wide area.