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North American Plant Hardiness Zones
by Mark Whitelaw
Return Back To OnlinePot's Grow Guides
Main
Grow Page#1 Or Main
Grow Page#2
The United States Department of Agriculture (USDA) in
cooperation with the National
Weather Service (NWS) has identified various
regions within North America by their
60-year average minimum winter
temperature. These regions, called "hardiness zones,"
are represented
by bands across the continent.
When we say a plant is rated to Zone 6, we mean it will
generally not survive the winter below -10F (-23C). Sometimes, however, you'll
read where a plant is rated between two zones (e.g., Zone 5 to 9). By
this we mean the plant can survive to -20F (-29C) in winter, but the summer
temperatures found in Zone 9 will be too warm for the plant to survive. That is,
the plant will consume more energy trying to survive than it can create with its
normal metabolic processes. The upper limit temperatures are not represented.
Sometimes you'll see a further refinement of the 10F divisions.
That is, the divisions are in 5 increments such as Zone 7a or 7b, for example.
When associated with the same numbered zone, the "b increment" is
always the warmer of the two. Therefore, Zone 7a means the average lowest winter
temperature is 0 to 5F (-18 to -15C), and Zone 7b is 5 to 10F (-15 to -12C).
The Dallas-Fort Worth Metroplex in Texas is divided. Dallas is
in Zone 8a, while Fort Worth is in Zone 7b. In this case, Zone 8a has an average
warmer temperature than Zone 7b.
In 1990, the USDA remapped and revised its chart for the
continent.
The charts below are provided for your reference. They are
provided as a guide to gardeners, and do not indicate individual
microenvironments which may occur in your neighborhood.
Hardiness Zone Table
Hardiness
Zone |
Avg. Min. Temp.
(F) |
Avg. Min. Temp
(C) |
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 |
below -46
-43
-40
-37
-34
-31
-29
-26
-23
-20
-18
-15
-12
-9
-7
-4
-1
2
4
above 7 |
Plant Hardiness Zones
U.S. Department of Agriculture
(Please be patient. This GIF takes a
while to download the first time - less than 20 sec. at 28.8Kbps.)
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