Remember how nice March was?  We are seeing the consequences of record setting heat that caused trees and shrubs to bud out too early.  Heavy frosts in April damaged the buds and now leaves are curling, turning brown, and even falling from trees.  The frost damage looks bad, but it will not threaten the tree.  The trees are healthy despite their appearance.

Hydrangea with frost damage

This Japanese Maple had no frost damage on the left where it was under a large tree. The right half had lots of damage.