Answer: A couple things might have happened to your lawn this winter. Since the areas that died back were the new areas, it's possible the grass didn't harden off properly going into winter and you had lots of winter die back. This is likely, especially if it grew green and lush into fall and you fertilized. Also, the variety of grass seed may be the cause. If it was predominanatly bluegrass and you had a periods of lack of snow cover this winter when it was cold, it may have died back. Try mixes with ryegrass and fescue next time. I'd rake up the area and look for signs of new growth. If you don't seen any in a few weeks, it's time to reseed!
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