There are two types of Zones that are usually discussed here. One is the USDA growing zone/climate, as described here
The other type of Zone is used in permaculture discussions to talk about the different areas on your property, organized according to how often you go there, and how much time is spent there. Zone 1 is generally closest to the house - front yard, kitchen garden, etc., places you go every day, and which need intensive management. Zone 2 is a little further out from the house, perhaps the larger garden, barn, etc, where you may not need to go every day, but still needs quite a bit of time and management. And on, until you reach Zone 5, which is the wild untouched forest.
"The rule of no realm is mine. But all worthy things that are in peril as the world now stands, these are my care. And for my part, I shall not wholly fail in my task if anything that passes through this night can still grow fairer or bear fruit and flower again in days to come. For I too am a steward. Did you not know?" Gandolf
This parrot is no more. It has ceased to be. Now it's a tiny ad: