Go to the store and pick a 20 pound bag of charcoal, And a can of starter. Figure where your going to dig. Clean snow and ice from the area. Pour the coal about two layers thick. Soak it, Light it and let burn for about a half hour. Get a garbage can lid or a piece of steel and cover. If you do this in the morning, By the next morning you'll be digging like summer time... A very tried and true method of getting the frost out... And it only costs a few bucks for the coal, and a whole lot easyer on your back !!!