Glenn, I'm in Luzerne county PA - Scranton/Wilkes-Barre area. The Pane e Vino and all of my trees are in varying size pots - from 2 gallon up to 20 gallon. All come inside my attached garage. I wish I could say that the garage is constant temp, but it is not. Most of time it would be around 40 degrees, but I frequently open and close the automatic garage door (many times on any given day) - plus sometimes when snowblowing, I end up leaving the garage door open for 30 minutes or so. So - there could be periods of time where it's below freezing.
As a little added protection, I huddle all the pots close together, near the house-side of the garage, and wrap the pots in one layer of R-19 insulation.
About once a month, I add some water to each pot - just to keep a little moisture in roots.
Knock on wood - so far so good.
Thanks
Joe