Cherry trees - barren?

Question

We have many varieties of cherry tree in our village. This spring none of them blossomed and there is no more than a handfull of fruit on any of them. I have four trees in my yard alone and I can't see more than about 30 cherries. What happened?

Answer 1

A late frost or no pollinators such as bees.  The bees seem to be dieing around the world.  I have only seen one this summer!

Answer 2

A late frost might have killed the buds before they blossomed.