It gets colder here than in seattle but for a shorter period of time. Our frost ground depth is not as deep and our growing season is much longer. This year we didn’t know what to do with all our tomatoes and they just kept coming.
Sounds like you are set. I could probably get by but for the fact I live outside of a decent sized city, and I don't think any place will be safe if it is near a city.
I've been keeping my eye out for some decent acreage in a more rural area.