New version of the USDA zone map

Discuss any and all issues that don't fit neatly into one of our other forum sections.
Post Reply
User avatar
jam
Ready to Bolt
Posts: 398
Joined: Tue Jun 14, 2022 11:23 am
Location: Slovakia, Central Europe, 48N
USDA Zone: 7a/b

New version of the USDA zone map

#1

Post by jam »

About half of the US shifted to the next warmer half zone.

https://www.ars.usda.gov/news-events/ne ... -zone-map/
Setting up a Chihuahuan laboratory.
User avatar
westfork
Offset
Posts: 247
Joined: Fri May 20, 2022 8:05 am
Location: NW Iowa
USDA Zone: 4b/5a

Re: New version of the USDA zone map

#2

Post by westfork »

There is so much variability in winter lows though. It is frustrating how many nurseries call a plant hardy to a certain zone if it can survive the posted zone minimum temperature. But to survive in a certain zone the plant must be able to endure the range on minimums, not just the average.
We are now a solid 5a with a -15 to -20F average minimum temperature.
So instead of our experienced annual minimums ranging from 0 to -38 as a 4b, can we now expect to range from 5 to -33?
Siouxland: USDA Zone 4b/5a & heat zone 6/7. Extremes at our farm: 108 F to -38 F.
Arid grassland with dry sunny winters, moderate summers, 27" annual precipitation.
User avatar
Samhain
Offset
Posts: 108
Joined: Tue Nov 24, 2020 1:55 pm
Location: Lucerne valley, CA 8b

Re: New version of the USDA zone map

#3

Post by Samhain »

No results for my zip code.
15F-110F. 14” annual rainfall. 8b. 3000’
Fairview
Offset
Posts: 192
Joined: Mon Aug 28, 2023 12:24 pm
Location: Texas
USDA Zone: 8

Re: New version of the USDA zone map

#4

Post by Fairview »

westfork wrote: Fri Nov 17, 2023 8:08 am There is so much variability in winter lows though. It is frustrating how many nurseries call a plant hardy to a certain zone if it can survive the posted zone minimum temperature. But to survive in a certain zone the plant must be able to endure the range on minimums, not just the average.
We are now a solid 5a with a -15 to -20F average minimum temperature.
So instead of our experienced annual minimums ranging from 0 to -38 as a 4b, can we now expect to range from 5 to -33?
There's a difference between weather and climate. Zones are based on long term climatic conditions. Weather is day to day. Our texas winter blast in 2021 was in the single digits for several day but I'm in solid zone 8.
Mckinney, Texas. 30 Miles North of Dallas. What I'm trying to grow: A ovatifolia: whales tongue, frosty blue, vanzie, sharkskin, parrasana, montana, parryi JC Raulston, Bellville, Bluebell Giant, havardiana, polianthiflora, parviflora, havardiana x neomexicana
User avatar
nsp88
Ready to Bolt
Posts: 572
Joined: Wed Jun 14, 2023 10:48 am
Location: Northeast Texas
USDA Zone: 8a

Re: New version of the USDA zone map

#5

Post by nsp88 »

westfork wrote: Fri Nov 17, 2023 8:08 am There is so much variability in winter lows though. It is frustrating how many nurseries call a plant hardy to a certain zone if it can survive the posted zone minimum temperature. But to survive in a certain zone the plant must be able to endure the range on minimums, not just the average.
We are now a solid 5a with a -15 to -20F average minimum temperature.
So instead of our experienced annual minimums ranging from 0 to -38 as a 4b, can we now expect to range from 5 to -33?
I thought it was insane to make us a half-zone warmer, too, since our last few winters have been wild (2021 was the wildest with record lows). Turns out the data they used was up until 2020, and didn't include 2021. I guess it will a lot longer until we get a map that has a chance of reflecting that.
zone map 2020.JPG
zone map 2020.JPG (160.46 KiB) Viewed 935 times
zone map new.JPG
zone map new.JPG (67.9 KiB) Viewed 935 times
User avatar
Meangreen94z
Ready to Bolt
Posts: 4823
Joined: Thu May 31, 2018 2:04 pm
Location: Austin, TX
USDA Zone: 8B

Re: New version of the USDA zone map

#6

Post by Meangreen94z »

FBB0616B-D2BF-4D6A-AA84-AA13B28C7693.jpeg
FBB0616B-D2BF-4D6A-AA84-AA13B28C7693.jpeg (292.01 KiB) Viewed 904 times
Austin, Texas
Post Reply