Some conifer damage is irreversible. Very often, needles damaged by salt spray is not replaced. The tree branches simply die, and leave an entire side of the tree dead. The only prevention would be to not plant these trees next to a salted road. Other plants, like the yews, might not show any damage, at z6 temps, if sited in a more sheltered spot, like my boxwood. Yews may replace some wind damage, but they grow slower than, say, boxwood, which may need several trims, over the season. Still, though, they won't have "the fully green color", those of us in the North want from BLEs, in winter. As for evergreen Rhododendrons/Azaleas, the burnt foliage may persist longer, before being replaced, because the flower buds are at the stem tips, and new growth won't begin until after the plant flowers, in May.
At a local strip mall, just the other day, I saw a bed of Knock Out roses, cordoned-off, with burlap, for the second year in a row. There was no wood damage, and the foliage is semi-evergreen. This variety of rose is a hardy, "own roots" (not grafted)type of rose, too.
Yeah, this two-week cold blast was a record-breaker, in terms of duration.