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Feb 14, 2017 10:09 AM CST

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If there is a newer map (2012) in which there have been some changes/ shifts since 1990, why would I want to see the 1990 map??

You make it difficult to get updated info. What's the point?
Feb 14, 2017 12:34 PM CST
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@dave, we have a zip code map somewhere? Confused
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Feb 14, 2017 12:45 PM CST
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The "Zone Lookup" is located under Tools & Apps. Zone lookup by zip code uses the 1990 map only, however the 2012 map has an enlarged mouse-over function to give you a clear view of you area. https://garden.org/nga/zipzone...
Last edited by eclayne Feb 14, 2017 12:47 PM Icon for preview
Feb 14, 2017 1:05 PM CST
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We include both maps in order to provide the most complete experience possible for the visitors to that page.
Feb 14, 2017 2:30 PM CST
Name: Lin Vosbury
Sebastian, Florida (Zone 10a)

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Hi Joycegodwin, Welcome!

I think some people like to see both the 2009 and 2012 maps to compare the differences from the old to the new map. I don't believe the administration of this site is trying to make it difficult to get updated information at all.

You can find more information regarding the maps and zones, etc. http://planthardiness.ars.usda...

And, this page gives more information about the maps and gardening: http://planthardiness.ars.usda...
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Feb 14, 2017 8:22 PM CST
Name: Daisy I
Reno, Nv (Zone 6b)
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I've always used the maps as guesstimates. They get me in the right box. But the boundries of a zip code are not going to be climate boundries. My zip code has elevation changes of a couple thousand feet - the west side is in the mountains and I am on the edge of the valley. The temps are probably 10 degrees colder there than here.

And then there is your own yard's climate. Buildings, fences, mountains, rivers all affect your climate. Are you on a hill top (warmer), hill bottom (colder), flat spot? Look for microclimates within your yard. My backyard is flat but it sits on top of a 10 foot tall rockery wall. It gets east sun so loses the sun about 1pm. But, its very warm compared to the west facing frontyard where there are no hills, or walls (and is also the direction the storms come from). But my front and back yards are both in Zone 6.

What I am attempting to say is that there are no easy answers. You have to figure out what temperature range you are in. According the the "maps", I am in zone 6 but I have a 4 year old chard plant growing on the south side of my house. The minimum temps for chard is about 20 degrees. Don't tell my chard - our low last winter was 7 degrees and the year before that was 5 degrees. This winter, the chard has been buried in a snow bank for most of the season (It doesn't usually snow here).

Never an easy answer... Smiling
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Feb 15, 2017 4:34 AM CST
Name: Yardenman
Maryland (Zone 7a)
In general, the climate zones seem to have shifted about 100 miles north in 20 years...
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