I have the good fortune of having many big oak trees around and the leaves are brown and dry. Guess I didn't do a very good job of maintaing my yard this year....lol. Good for Jeter non-the-less. Never thought about the frost line. I am in Central Texas and I don't believe it is as low as yours. Seems to me it is about 6 inches, but I will check into it. Thanks again.