We Think We Might Be in Zone 6!

For the past year and a half, we've been trying to figure out what growing zone--referred to by every growing magazine, book, and catalog and usually represented by something as dreadful as this, which is the USDA map from the United States National Arboretum:
which really only establishes that there are places in Canada where you can't grow anything--not even hockey players.

Zooming in on Idaho,
we find a very lovely design and some the need for a better grasp of geography than I actually possess. We think we're in a yellow or dark yellow area--which they divide up as Zone 6a and 6b.

Just in case, I visited this page. It's from the Arbor Day Foundation, and if anyone knows about growing things, I assume it's tree people. You simply type in your zip code and it gives you the zone! Fabulous! We are finally going to know....and it says we're in either zone 6 or 7. This explains a lot--if the experts on trees can't figure it out, I don't feel so bad. We're going to pick Zone 6 as we seem less likely to kill plants that way, and just realize I'm likely to get overambitious no matter what zone I think we're in anyway.