WillisC, that link has been my favorite since someone told me about it on garden web. Wow! I am amazed that most zone maps lump everyone in a 50 mile area into one zone, when within that zone are a few microclimates. They don't take into account altitude within a geographical area. I love that map! You can find the closest street on it, and determine your actual zone, which is very helpful in determining what will grow best where you are. Our property is so weird, the same plant flowers and bears fruit a month earlier at the top of our hill in the front yard, than the same plant at the bottom, so even that knowledge is helpful in placing plants.
Suzi