My japanese maple in Maryland has not yet leafed out. The buds are tight so this cold front should prob not hurt it. My lilac however, has unfurled it leaves which leads me to believe that it is "setting its buds" If so we will likely not have any blooms this year-if they freeze they won't recover. The plant will be fine.
Usually I just have problems with tulips and daffodils when we have a late snow. I just cut all the flowers and bring em in.
Also, if you haven't truly uncovered your beds yet the plants underneath will be fine!
More than you wanted to know. I am like that