US Hardiness Zone Finder
Enter a five-digit US ZIP code to look up its PRISM 2023 hardiness zone and see plants in our verified library that tolerate that winter.
Hardiness zone finder by ZIP
A hardiness zone finder answers one winter question for a US address. Type a five-digit ZIP. The page returns the PRISM 2023 zone for that ZIP, the typical annual minimum temperature that band represents, and a plant list limited to species that can take that winter and the light you chose. The same ZIP always resolves to the same zone. Changing the light filter changes the plants, not the zone.
What a hardiness zone means
The number is the average coldest night of the year, grouped into 10-degree bands and then split into a and b halves of about 5 degrees. Zone 6b, common across much of the mid-Atlantic, bottoms out near −5°F. Zone 5b is the next step colder, and zone 7a is the next step milder. A plant rated only to zone 7 is not offered for a zone 5 ZIP, because winter kill is the failure this map was built to prevent. The rating is a winter number. It does not describe summer heat, humidity, the length of the season, or how long the soil stays frozen.
Plants for that zone
After the zone comes back, the list is the species in our library whose published range includes it. Each row shows the hardiness span, the light it was checked against, the height and width it reaches at maturity, and a nursery price estimate for one plant. A short list means a short library, not a short climate, and the page says so when only a few species are verified. Species recorded as invasive in that state are left out. A second group comes from the USDA PLANTS database. Those rows can say the plant grows in the area, and they do not include a spacing distance, because that source does not publish mature spread.
How to use the plant list
Set the light before you shop. Full sun, part shade, and shade are different lists for the same ZIP, and the house often shades the ground next to it for part of the day. Take the quantities, the spacing, and the mature height to the nursery, and buy a size close to the one the estimate assumed. If you want every species we have checked for that winter, open the zone page linked under the result. That page is the full set. The list above it is the set that also matches the light you picked.
What a zone does not tell you
Soil, drainage, wind, deer, road salt, and planting rules sit outside the map. A plant that survives the winter can still fail in a wet bed, a hot courtyard, or a spot the deer already know. This lookup is not the official USDA map, and it cannot see the microclimate on one side of a wall. Read the limit under the source note, then confirm the final purchase with a nursery that warranties its stock.
What this lookup uses
The lookup covers 40,502 US ZIP codes using PRISM Climate Group's 2023 plant-hardiness dataset from Oregon State University. Hardiness range, light requirement and mature size are checked against the Missouri Botanical Garden Plant Finder and the NC State Extension Gardener Plant Toolbox. Price is an estimate: no authority publishes US retail plant prices, so it is sampled from published 2026 nursery price lists by container size (September 2026) and varies by region, season and supplier.
This is not the official USDA map and it cannot account for soil, drainage, wind, local microclimates or planting restrictions. Confirm a final purchase with a local nursery.