waltseed

It is normal for mail-order companies to dig trees and bareroot them in the fall. They are stored in controled temperature and humidity over the winter and shipped in the spring. Losses are few.
Of course mailing packages have controled temperature, but controled humidity isn't a problem.
Some years back, I dug a honeylocust in full leaf, early summer if I remember right, which I probably don't. Anyway, I put it bareroot in a plastic bag with a moist sponge and mailed it to Ozzerbon in Netherlands.
It survived.
I have no idea how long it was out of the ground. Less than a week, i would guess.
Of course, honeylocusts are tough trees. But so are many other trees.

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Waltseed