Symptoms of winter injury have been showing up on conifers over the past month.
In upstate NY sub-zero F temperatures were recorded in late January and in early March we experienced a sudden drop of temperatures from above freezing to the single digits in one day.   These low temperatures and fluctuation events are likely the cause of the winter injury symptoms we are seeing now.
Individual plants in grand fir plantings were affected, sometimes with the entire individual trees dying back.

Concolor fir (foreground) and Grand fir (back left) displaying winter injury.

Junipers and spruce were also affected in some areas.

Juniper with a major portion of the shrub showing dieback.

We also are observing some needle desiccation on younger trees.

Young fir tree with winter needle desiccation.