I can't tell from your picture, but have you removed enough of the grass around the tree so it is getting the proper water and nutrients?

There are buds visible on the upper portions but it is impossible to tell from a photo if they are still viable. Of more concern is the very obvious discoloration of the stems lower down but above the current foliage. That is pretty indicative of some sort of problem, but whether it is cold damage or possible fungal problems would require an in-person evaluation. I'd take the branch on the farthest right of the photo that has the upward growth off at the branch collar and into your local extension office for an accurate diagnosis. They will also be able to tell you what your options are for saving the rest of your tree.