Once dormancy is broken, growth starts slowly. As tissues
develop, however, they become less tolerant of freezing temperatures,
so the later a cold snap, the greater the likelihood that a plant
will be damaged.
That said, frost damage whether from a late spring frost
or after a mid-winter thaw that caused lower-chill plants
to come out of dormancy does not necessarily mean death,
because many plants have another set of buds in reserve.
So, if you have frost-damaged plants this spring, be patient
they may come back. If they do, treat them especially
well this growing season to avoid further stress, and, as
with all gardening, cross your fingers and hope for the best.
A late cold snap would damage this bud and may cause die-back.
If this happens, the tree will require special care.