Because the pump has a built-in check valve the tube will of course remain full of water all the way to the end. Try running a piece of 3/4" or larger pvc through the foundation wall to the outside and as long as possible on the inside. Terminate the tube into the pvc. When the pump shuts off the water should drain out of the pvc before it has a chance to freeze, and the tube is out of the outdoor weather. If still a problem, wrap the pvc with self regulating heat tape.
There is nothing more frightful than ignorance in action....Mark Twain