The last two winters have been bad to many of the hydrangeas that bloom on old wood. Yours appear to be H. macrophyllas (either mopheads or lacecaps). I would start by making sure they have 3-4" of mulch. Then if you want to make sure that there are blooms next year, consider adding winter protection when the plant goes dormant. Then make sure that they have evenly moist soil until the soil freezes (avoid periods of dry-wet-dry-wet). Finally, because macrophyllas develop invisible flower buds near the ends of the stems between July (in the South) and August (in the North), I would leave any pruning tasks -if you have any in mind that is- for after they bloom in Spring 2016 thru before the end of June so you get to enjoy some bloomage.