Orchard grass turning yellow??

I planted 25 acres of persist orchard grass at the end up August. Soil test said I didn't need any fertilizer or lime, besides the 30 units of nitrogen for establishment. I went ahead and put 30-30-40 on it. Got a awesome stand it's 8"-12" tall super thick. My question is it is turned kinda yellow this winter. Is this normal for persist?

Orchard grass turning yellow??