USDA Plant Hardiness Zone Map Introduction
Go to Hardiness Zone Map.
USDA Miscellaneous Publication No. 1475, Issued January 1990
This map supersedes U.S. Department of Agriculture Miscellaneous Publication 814, "Plant Hardiness Zone Map," which was revised in 1965. This 1990 version shows in detail the lowest temperatures that can be expected each year in the United States, Canada, and Mexico. These temperatures are referred to as "average annual minimum temperatures" and are based on the lowest temperatures recorded for each of the years 1974 to 1986 in the United States and Canada and 1971 to 1984 in Mexico. The map shows 10 different zones, each of which represents an area of winter hardiness for the plants of agriculture and our natural landscape. It also introduces zone 11 to represent areas that have average annual minimum temperatures above 40 F (4.4 C) and that are therefore essentially frost free.
How
to Use the New Map
Zones 2-10 in the map have been subdivided into light- and dark-colored sections
(a and b) that represent 5 F (2.8 C) differences within the 10 F (5.6 C)
zone. The light color of each zone represents the colder section;
the dark color, the warmer section. Zone 11 represents any area where
the average annual minimum temperature is above 40 F (4.4 C). The map shows
20 latitude and longitude lines. Areas above an arbitrary elevation
are traditionally considered unsuitable for plant cropping and do not bear
appropriate zone designations. There are also island zones that,
because of elevation differences, are warmer or cooler than the surrounding
areas and are given a different zone designation. Note that many
large urban areas carry a warmer zone designation than the surrounding
countryside. The map-contains as much detail as possible, considering
the vast amount of data on which it is based and its size.
| In using the map to select a suitable environment for a landscape plant, today's gardeners should keep in mind the following: |
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Stress Factors.
We became aware of additional stresses to plants
during the 1970's. Acid rain, gaseous and particulate pollution,
security lighting, and toxic wastes, among many other stress factors, have
significantly increased the potential for unsatisfactory performance of
landscape plants. We need to document the tolerances of plants to
these factors.
New Plant Management Systems. New techniques of planting, transplanting, watering, fertilizing, and providing pest control measures have done much to increase the vigor of landscape plants. But used unwisely, these same measures can reduce plant hardiness. Artificial Environments. We have pushed the use of plants into totally artificial environments such as expressways, malls, elevated decks, and buildings where plant roots are totally removed from the ground and its warming influence. The assortment of plants that can adapt to such environments is proving to be very restricted. Hardiness ratings alone are inadequate to guide landscapers in selecting the most successful plants.
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Additional Helpful
-- Information Basic Plant Requirements || How the Map Was Started How the Map Was Created || Why the New Map was Created
Hardiness Zones -- Indicator Plant
Examples -- |
| Go and visit the usda.gov site: http://www.usna.usda.gov/Hardzone/index.html |
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 USDA Plant Hardiness Zone Map |
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USDA Miscellaneous Publication No. 1475. Issued January 1990.
Authored by Henry M. Cathey while Director, U.S. National Arboretum
Edited, formatted and prepared for the US National Arboretum web site by Ramon
Jordan, March 1998 & Revised March 2001
U.S. National Arboretum, Agricultural Research Service, U.S. Department of Agriculture,
Washington, DC 20002
** Special thanks to Jody Shuart and Scott Bauer, ARS Information Staff
Note: This publication is not copyrighted, and permission to reproduce all or any part of it is not required.
