Hardiness Map
This map follows the USDA cold hardiness system, which is based on average minimum
temperatures in each area and gives a guideline for plant availability.
Zones can be divided further into "a" or "b". When used,
"a" refers to the colder half of a zone and "b" to the warmer
half. For example, Zone 4a indicates temperatures of -25° to -30° F.
Plant material in our catalog is rated with a USDA zone number, which is correct
to the best of our knowledge. However, we cannot be responsible for hardiness
since growing conditions, site selection, and unusual winter weather will affect
winter survival.
To find your zone enter your zip code at this web
site.
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Approximate Range of Average Annual
Minimum Temperatures for Each Zone
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Zone 3
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-40° to -30°
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Zone 7
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0° to 10°
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Zone 4
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-20° to -10°
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Zone 8
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10° to 20°
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Zone 5
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-20° to -10°
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Zone 9
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20° to 30°
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Zone 6
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-10° to 0°
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Zone 10
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30° to 40°
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