It hits -40F occasionally here, and -30F certainly. It's even hard to find an apple that will winter over.

Someday, I want to dig a giant hole & build a glass block geothermal indoor orchard & aviary. It's a big project, so as of now it's still in the wishes & wants bucket, but I have about 150 cases of empty glass latte syrup bottles in a storage unit, to make a domed roof for it, so that's a small start.