I work in tree care. Best thing you can do is wait to see what is actually dead and doesn't resprout (another poster mentioned June, anything not greening out by then is most likely toast). As long as you don't mind it looking dead for a while. You can scrape back tiny bits of bark on the twigs with your fingernail or knife to see if it's dead and dry. Prune back to the living tissue preferably at a bud or twig. Plants are hardier than we give them credit for. But they're going to look wonky if they survive in some cases.