Ellie in Burke keeps it simple; she writes: “Is it too late to trim our crepe Myrtle?”
No, it is not too late at all, Ellie. In fact, people who foolishly pruned their crepe Myrtles back in the fall exposed the poor plants to the possibility of severe winter damage.
The best time to prune crepe Myrtles is right after they begin growing again in the spring. Be sure to remove any portions that were killed by our wretched winter, and give every shoot at least a little haircut to stimulate the best flowering.
If you want to reduce the height a little bit, you can safely remove a few feet of growth. But don’t commit “crepe murder” by cutting the poor thing all the way back to the ground. People guilty of this horticultural homicide eventually wind up with little shoots growing out of elephant legs!