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Old 03-11-2014, 12:12 AM
 
Location: Fort Worth, Texas
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In Your Opinion, can a Plant Hardiness Zone experience winter lows colder than what the zone designation where you live indicates the zone you are in? Please Give Examples that this has happened where you live if you can recall such occurrences.
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Old 03-11-2014, 05:40 AM
 
Location: A blue island in the Piedmont
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Plant Hardiness Zones are calculated based on past trends.
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Old 03-11-2014, 06:39 AM
 
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About - Maps & Gardening

About | USDA Plant Hardiness Zone Map
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Old 03-11-2014, 10:53 AM
 
Location: Home is Where You Park It
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Of course - plant hardiness zones are based on averages.
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Old 03-11-2014, 07:02 PM
 
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Quote:
Originally Posted by jacqueg View Post
Of course - plant hardiness zones are based on averages.
indeed, whether you call the numbers/designations "averages", "trends", or whatever we are not making any guarantees that the temperature parameters of a climate or gardening "zone" (USDA, sunset magazine, etc.) will always be there. all these things simply indicate that MOST but not ALL of the time those temperatures will be within a given range. however, because climate and weather is often variable there is always the chance that there may be a significant deviation in high or low temperatures at some point in time for many places. FWIW, the latest USDA map placed me in their 9b several years ago and this winter we had several days of colder than average weather (i.e. 9a) and that relatively small difference was hard on some of my plants. the zones are useful rough guides to plant growth and survival but unfortunately they not infallible guardians of our respective climates.
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Old 03-12-2014, 08:28 AM
 
Location: East of Seattle since 1992, 615' Elevation, Zone 8b - originally from SF Bay Area
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There were changes to the hardiness zone ranges a couple of years ago due to climate changes. We are in 8B, which is 15-20F, yet we have been down to 10 a few times. I will protect anything that is borderline as it gets down to about 18
just to be safe.
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