USDA Plant Hardiness Zone Finder (by ZIP Code)
Find your USDA plant hardiness zone from your ZIP code — based on the 2023 USDA map — with the average extreme winter low temperature, so you can choose plants that survive your winters.
How to use
- 1Enter a 5-digit US ZIP code.
- 2See your zone (like 7b) and its average coldest winter temperature.
- 3Pick plants rated for your zone or colder (a lower number).
Frequently asked questions
What does the zone number mean?
Each zone is a 10°F band of average annual extreme minimum temperature; 'a' and 'b' split it into 5°F halves. Zone 7b means the coldest night of the year averages 5 to 10°F.
Did zones change in 2023?
Yes — the 2023 USDA map, based on 1991–2020 data, shifted about half of the US into a warmer half-zone compared with the 2012 map.
Does the zone cover everything plants need?
No — it only reflects winter cold. Summer heat, rainfall, soil and microclimates also matter.