As spring is waking up and showing signs of life, ninebark is a little bit deceiving. It first has very small leaf buds that are barely noticeable. When it is ready, it quickly grows colorful leaves. I would give it a week or two before being too concerned. Then, prune out any winter damage. And, maybe tip back any branches that are a little unruly. The nice thing about ninebark is that it is forgiving of any pruning errors!
Thanks for writing!