I see this all the time during the spring clean-up season (Everyone grows these up here...everyone). Very common. I find that it is often better to cut away the dead/wind burned looking areas. The plant seems have an easier time sending up all new growth rather than fighting to keep those sections going. It's hard to kill a rhoddy without uprooting them...but those burned up areas I've seen persist year after year sometimes and then when they do get cut away it leaves a big gap in the overall shape of the shrub that takes a lot longer to fill back in again.
Something you can look for...is there any buds forming at the tops of the burned out sections? They should at this time of year if they are going to send out leaves or flowers. If not, definitely cut those sections out now, as they are probably too far gone to save. If so, give it some time and see what it does when it gets a bit warmer.
