Endless Summer Hydrangea

I have babied 5 Endless Summer Hydrangea in the front of my house for 4 years now. With the winter being so mild here in Zone 5 and the early warmth in March they were in full leaf mode when Mother Nature remembered it was March and not May and decided to throw the below freezing temps at us again. Now all the leaves have turned brown. I am afraid these plants are not going to flower this year as they have in the past. They look absolutely horrible and as I said they are in the front of my house. I am so tempted to dig them up and put something else in their place that requires less patience. Anyone else have/had the same problem?