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General 2023 USDA Plant Hardiness Zone Map Discussion


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On 11/17/2023 at 11:49 AM, JJPalmer said:

Jumping off the FL-specific thread, I figured I'd start a general discussion on the release of the latest map by the USDA: https://planthardiness.ars.usda.gov/

Kicking things off, a few interesting things I've found:

  • Inclusion of a significant amount of 10a throughout SE Louisiana including a small section in DT New Orleans along with a *very* small amount of 10b
  • Northernmost extent of 10a extends into SW Oregon (Brookings)
  • Poor representation of cold sinks in microclimates throughout the Rockies: Jefferson, CO hit -24f a couple of weeks ago during a fairly typical October cold snap, but they're listed at 5a (-20f to -15f) and will routinely fall below -25f.  Peter Sinks in Utah hit -60f last year and hits -40f several times annually and is listed as 4a
  • 10b in S Texas (makes sense) despite significant freeze a couple of years ago
  • General trend of warmth nationwide (ex. introduction of zone 6 in Wisconsin for the first time, reduction of zone 4 throughout the nation)
  • Better ability to handle UHI than prior (ex. Minneapolis and Orlando)

Wow I m in 8a now. Holly mackerel!!!

No wonder i keep Sabal palmetto, Butia capitata, Sereona repens with some protection.


Thxs for this thread.


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  • 1 month later...

Taking another look, I notice z8b in NE GA. An area between Hartwell, Toccoa, and Seneca, SC is rated z8b. Not sure what the minimum temps were in December, 2022.

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On 11/18/2023 at 4:12 AM, RFun said:

It's perfectly legit to me.  Water plays a big role in that.  There's a larger area of 10b than that, but there aren't many weather stations in that unpopulated area.

Have y'all been to the stretch of Louisiana from Belle Chase to Venice? It's surrounded by water like you said.  By the time these big cold outbreaks hit there from  the west they are totally weakened. Also they commercially grow citrus and they have the biggest Majesty palms I personally have ever seen.  It's quite  Palmyra down there lol

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