Zone Finder





Check the zones listed in the individual plant quick facts to check if it is cold hardy for your area or use zone as a search criteria in the Plant Finder.

To determine if a plant is sufficiently cold hardy, the USDA created numbered zones indicating winter low temperatures; the lower the zone number the colder the winter.

  • If the coldest winter temperature expected in your area is -15°F (zone 5) then any plants rated zones 3-5 will survive the winter temperatures in your area.
  • If you live in very warm winter areas (zones 9-11) plants with zones 3-4 ratings are not recommended. The lack of freezing winter temperatures do not provide a time for winter dormancy (rest).

    Hardiness
    Zone    		 Avg. Min. Temp.
    (F)
    1
    2a
    2b
    3a
    3b
    4a
    4b
    5a
    5b
    6a
    6b
    7a
    7b
    8a
    8b
    9a
    9b
    10a
    10b
    11    		 below -50
    -45
    -40
    -35
    -30
    -25
    -20
    -15
    -10
    -5
    0
    5
    10
    15
    20
    25
    30
    35
    40
    above 45

What are Hardiness Zones?

The Plant Hardiness Zones divide the United States and Canada into 11 areas based on a 10 degree Fahrenheit difference in the average annual minimum temperature. (The United States falls within Zones 2 through 10). For example, the lowest average temperature in Zone 2 is -50 to -40 degrees Fahrenheit, while the minimum average temperature in zone 10 is +30 to +40 degrees Fahrenheit. See more.

Suggested hardiness zones have been indicated for all trees and perennials available online from the National Arbor Day Foundation. If a range of zones, for example, zones 4-9, is indicated, the tree or perennial is known to be hardy in zones 4, 5, 6, 7, 8, and 9. Suitable hardiness means a plant can be expected to grow in the zone's temperature extremes, as determined by the lowest average annual temperature.

Keep in mind that local variations such as moisture, soil, winds, and other conditions might affect the viability of individual plants.

For more information, please feel free to contact our customer service department.