Our ground rarely freezes here is the north Georgia mountains, but we had 3 days below freezing, right after rain, and a low of 4 degrees, and in fact the ground froze so hard that I couldn't get the stakes for my blow-up Christmas decorations out of the ground. This freeze may or may not help my efforts to grow lilies. Last April, we got a very late freeze after the lilies were already 1 foot tall. Needless to say, the stems melted with the freeze and never grew back. Because our ground does not freeze, I suspect the bulbs never really go dormant, and they start growing very early in spring. They are doomed if there is a late freeze. I have not found the "perfect" strategy yet to outwit Mother Nature (as if such a thing is possible), but I tried again this fall to plant lily bulbs. Fingers crossed I get some blooms next summer.