Possibly, but I wouldn't bank on it. You may wait it out a year and replant, but I would suggest just inter-planting this spring in the areas that have died off. If you have very much grass competition, you should really consider controlling it through spot or strip herbicide treatments. You'll have a lot better establishment then. Down further south here in SW Arkansas it is almost always a necessity just to keep the grasses from out-competing the trees in their first year. Just make sure the herbicide you choose isn't going to harm the trees as well.