The USDA Hardiness Zone Map is a color chart that was created in 1990. The majority of national garden publications and nurseries use this zone map to determine plant hardiness, according to the National Garden Association. The map divides the United States, Canada and Mexico into 11 different zones according to the climate. Each of the zones differs by 10 degrees Fahrenheit in a typical winter. Planting flowers designated for your specific zone ensures the best growing environment.
Find your zone by state. Use the link provided in Resources for the National Arboretum. Locate your states abbreviation and click on it. This opens a page with a region of the map that includes the state selected. Look at the map to find your zone using the color chart provided.
Locate your USDA hardiness zone by region. Open the link provided in Resources for the National Arboretum. Find your location on the map of North America and click on it to access the regional map. Locate your exact zone using the color chart to match the colors of your location.
Use your zip code to find your hardiness zone. Access the USDA Hardiness Zone Finder using the link provided in Resources for the National Garden Association. Insert your zip code in the space provided and click on the “Go>” button. This opens a new page with your zone listed along with other useful links, such as reports from your area, public gardens or events in your zip code and plants that develop best in your growing zone.