Zone Map

What zone am I in?
The National Arboretum offers the USDA zone map online and it's quick and easy to determine your zone. Click here.

The USDA Plant Hardiness Map

This map shows the major hardiness zones of the United States and provides a guide to winter hardiness as you make your plant selections. In warmer zones, summer hardiness is an equally important determinant of success, and the second number in the ratings that accompany each plant in our catalogue or on our Web site reflect our best, though imprecise, knowledge of a plant’s southern range.

Please note that the genetic hardiness of plants is not the only factor in their performance in extreme temperatures. Results will also be affected by soil and moisture conditions, exposure of the site, cultural practices, night as well as day temperatures, and, of course, recent weather patterns. Plants that thrive in northern sun may need shade in the South. Heat combined with humidity and clay soil can break the spirit of a plant that would happily bake in desert sun.

Naturally, local climates may vary substantially from this highly simplified map, and it is also clear that the cool summers of Zone 8 in Oregon could not be more different from the scorching heat and humidity of Zone 8 in Georgia. California gardeners have a Mediterranean climate unique to them. Wise gardeners use their instincts, observe other gardens in their area, determine the provenance of plants they grow, and above all experiment in their gardens. They, and we, are frequently amazed by their success.

Range of average annual minimum temperatures for each zone

Zone 2 -50°F to -40°F

Zone 3 -40°F to -30°F

Zone 4 -30°F to -20°F

Zone 5 -20°F to -10°F

Zone 6 -10°F to 0°F

Zone 7 0°F to 10°F

Zone 8 10°F to 20°F

Zone 9 20°F to 30°F

Zone 10 30°F to 40°F

Our Partners: Botanic Gardens/Hort Societies | Garden Center Partners | Subscribe to Fine Gardening