Thanks Ottawan, that's exactly what I needed to know. I have plenty of temporary storage in my tractor shed until the temps reach a cold 20F. It'll be November, near Thanksgiving, for the temps to get that low. Then I'll move them into the cellar.
I remember my grandfather and my dad wrapping the trees with tar paper and topping with a metal pail, in Brooklyn NY, but that was zone 6 or warmer. Once or twice a tree died back to ground level, but always grew back from the roots.