USDA Hardiness Zone by ZIP Code
Find your 2023 USDA plant hardiness zone by ZIP code, city or your current location, with the winter temperature it stands for and a note when you sit near a zone boundary.
2023 hardiness zone map
Click a dot to see that city’s zone, sunrise and daylight by month.
This is not the official USDA Plant Hardiness Zone Map. Zones are derived from the official 2023 dataset, resampled to about 2 km. Dots mark cities with their own page.
Source: USDA Plant Hardiness Zone Map, 2023. Agricultural Research Service, U.S. Department of Agriculture, planthardiness.ars.usda.gov. Underlying data © PRISM Group, Oregon State University, prism.oregonstate.edu, accessed 2026-08-30.
Hardiness zones by state
Zone range across each state’s ZIP codes.
- Alabama 7b–9b
- Alaska 1a–8b
- Arizona 5b–10a
- Arkansas 7a–8b
- California 5b–11a
- Colorado 4a–7a
- Connecticut 6a–7b
- Delaware 7a–8a
- District of Columbia 7b–8a
- Florida 8b–11b
- Georgia 7a–9a
- Hawaii 10a–13a
- Idaho 4a–7b
- Illinois 5a–7a
- Indiana 5b–7a
- Iowa 4b–6a
- Kansas 5b–7a
- Kentucky 6b–7b
- Louisiana 8b–10a
- Maine 3b–7a
- Maryland 6a–8a
- Massachusetts 5b–7b
- Michigan 4a–6b
- Minnesota 3a–5a
- Mississippi 7b–9a
- Missouri 5b–8a
- Montana 3b–6b
- Nebraska 5a–6a
- Nevada 5a–9b
- New Hampshire 4a–6b
- New Jersey 6b–8a
- New Mexico 5a–8b
- New York 4a–7b
- North Carolina 6b–9a
- North Dakota 3b–4b
- Ohio 6a–7a
- Oklahoma 6b–8a
- Oregon 5a–9b
- Pennsylvania 5b–8a
- Puerto Rico 11b–13b
- Rhode Island 6b–7b
- South Carolina 7b–9a
- South Dakota 4a–5b
- Tennessee 7a–8a
- Texas 6b–10b
- Utah 4b–8b
- Vermont 4a–5b
- Virginia 6a–8b
- Washington 5b–9b
- West Virginia 5b–7a
- Wisconsin 4a–6a
- Wyoming 4a–6a
Zone temperature chart
Each zone is the average coldest winter night. Zone 7b, for example, means a typical winter’s coldest night falls between 5 and 10 °F.
| Zone | Coldest night (°F) | (°C) |
|---|---|---|
| Zone 1a | −60 to −55 °F | −51.1 to −48.3 °C |
| Zone 1b | −55 to −50 °F | −48.3 to −45.6 °C |
| Zone 2a | −50 to −45 °F | −45.6 to −42.8 °C |
| Zone 2b | −45 to −40 °F | −42.8 to −40.0 °C |
| Zone 3a | −40 to −35 °F | −40.0 to −37.2 °C |
| Zone 3b | −35 to −30 °F | −37.2 to −34.4 °C |
| Zone 4a | −30 to −25 °F | −34.4 to −31.7 °C |
| Zone 4b | −25 to −20 °F | −31.7 to −28.9 °C |
| Zone 5a | −20 to −15 °F | −28.9 to −26.1 °C |
| Zone 5b | −15 to −10 °F | −26.1 to −23.3 °C |
| Zone 6a | −10 to −5 °F | −23.3 to −20.6 °C |
| Zone 6b | −5 to 0 °F | −20.6 to −17.8 °C |
| Zone 7a | 0 to 5 °F | −17.8 to −15.0 °C |
| Zone 7b | 5 to 10 °F | −15.0 to −12.2 °C |
| Zone 8a | 10 to 15 °F | −12.2 to −9.4 °C |
| Zone 8b | 15 to 20 °F | −9.4 to −6.7 °C |
| Zone 9a | 20 to 25 °F | −6.7 to −3.9 °C |
| Zone 9b | 25 to 30 °F | −3.9 to −1.1 °C |
| Zone 10a | 30 to 35 °F | −1.1 to 1.7 °C |
| Zone 10b | 35 to 40 °F | 1.7 to 4.4 °C |
| Zone 11a | 40 to 45 °F | 4.4 to 7.2 °C |
| Zone 11b | 45 to 50 °F | 7.2 to 10.0 °C |
| Zone 12a | 50 to 55 °F | 10.0 to 12.8 °C |
| Zone 12b | 55 to 60 °F | 12.8 to 15.6 °C |
| Zone 13a | 60 to 65 °F | 15.6 to 18.3 °C |
| Zone 13b | 65 to 70 °F | 18.3 to 21.1 °C |
Zone is half the story
Your zone tells you which plants survive the winter. It doesn’t tell you which will thrive, and the biggest reason a well-chosen plant struggles is light. A “full sun” shrub in 3 hours of sun will sulk in any zone.
Every plant tag pairs a zone with a light need. This page gives you the zone. The Deconstruct Sun app measures the light for the exact spot you plan to plant, and shows the zone there too.
Questions
What is a USDA plant hardiness zone?
A hardiness zone tells you how cold winter gets where you live. It is based on the average coldest night of the year over 30 years (1991–2020 for the 2023 map). Each zone is a 10 °F band, split into a colder “a” half and a warmer “b” half. Plants are labeled with the coldest zone they survive.
How do I use my hardiness zone?
Choose perennials, shrubs and trees rated for your zone or a colder one. A plant rated for zones 5–9 should survive winter anywhere in that range. Zones say nothing about summer heat, rainfall or sunlight, so check the light needs on the tag too.
Did my hardiness zone change in 2023?
Possibly. The 2023 USDA map used newer, more detailed weather data and about half of the country shifted into the next warmer half zone compared with the 2012 map.
What does “near the boundary” mean?
Zones are drawn from about 2 km grid cells. If neighboring cells are a different zone, the lookup says so, because a single address can sit right at the edge. Hilltops, valleys, cities and big lakes all shift local winter lows.
Is this the official USDA map?
No. This lookup is derived from the official 2023 USDA dataset and resampled for speed. For the official map, see planthardiness.ars.usda.gov.
Know the sun before you plant.
Free on iPhone. Pro is a one-time $11.99, no subscription.