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The Arbor Day link puts me in zone 5-7. Not really helpful. Other sites have told me 6B. The thing is, if you look at a hardiness zone map, you can see that Salt Lake City is really on the fringe of several zones. The Wasatch Range of the Rockies are five minutes from my house but I'd be in the middle of a desert if I were to drive less than an hour west. It's kind of frustrating. I just know better than to plant much of anything before early May, and with a lot of things, I have to wait till mid-May to make sure the frost is over.
I don't think lows of -22 would put you into zone 7. With those temps you would be in a zone 4b. I'm in zone 7a here in Kentucky and it has only gotten down to 6 degrees, which would mean so far we've had a zone 7b winter.
According to the USDA map I'm in Zone 5, but I like your link better which says zone 6
I'm just going to continue pushing the envelope with what I "should" be able to grow and keep with containers and aim to winterise indoors, especially as our winters can range from mild to being slammed.
Some of these maps show Buffalo as low as zones 2 and 3! Madness! We're technically a zone 5b but can get away with a lot of zone 6 plants with a little care and maybe sneak in some hardy zone 7s with moderate care depending on how close you are to Lake Erie and if there is moderate cover.
Long Island zone 7b/8? You've got to be kiddin - their average high/lows are similar to SW PA which is zone 6. I live in zone 7 - Richmond VA
I'm not kidding and no they're not that similar, lows are very important in determining the hardiness zone, I'll use Pittsburgh & NYC as an example:
Dec:
Pittsburgh - 40/26
NYC - 44/32
Jan:
Pittsburgh - 37/22
NYC - 40/27
Feb:
Pittsburgh - 40/24
NYC - 41/28
Plus our Winters are slightly milder than NYC's on top of that. Plus we're on the Atlantic Ocean which keeps us from getting cold like it does inland. I don't live in zone 6 (eww lol), according to that USDA map I'm in 7b but over the past few years we've been like 8a so I say borderline 7b/8a. We rarely go below 20 believe it or not, maybe like twice a year if that, and if we do it's only for a couple of hours at night.
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