Plant hardiness zone

Thanks j-bird that will help people. When we are spread across the USA we need to remember all growing situations are not the same.

Portland, TN Zone 7a
I'm so far down here in the south that if you're above the Mason/Dixon....I just assume we're in different worlds. :D
Fact is CnC that it sort of is - that was why I asked folks to post it because it can make a HUGE difference. I figured ifI aksed them to add it that I should post a way for them to find out what it is!
If everybody lists their USDA zone along with their location in their profile, it really helps when replying to and viewing questions/ suggestions.