Winterize oak tree? sapling? what ever I have?

I transplanted an oak plant in the spring. It had 3 leaves on it when I transplanted it. Those leaves died and I had 2 new sprouts of 4 leaves each this summer. It is about 6" tall. I ume that even though it did not grow very tall the root system must have grown quite a bit. Is there anything special one has to do far an oak tree of this size to prepare for winter? I live in the northern Illinois area and it gets quite cold. I know trees must be able to survive winters but I would like to make sure this tree lives. I should also note that this tree is planted between my sidewalk and the street. If we get a lot of snow and the street gets plowed onto where my tree is will this hurt it chance of survival?