Michael:
Northern white-cedar, or arborvitae, trees took a big hit last year due to the drought and the excessive heat. Many northern white-cedar trees simply died.
Be patient and keep the trees in place "if" the branches still show signs of life (scratch the twigs to determine if there is any fresh, green/white tissue just under the surface of the twigs). This spring's moisture surge should resurrect those trees that are still hanging on from last year's drought.