The tight supply means higher prices and less selection.
Experts say that during the Great Recession 10 years ago, farmers cut back on growing trees, affecting today's supplies.
The top 5 picks for Christmas trees
They say larger retailers won't be impacted as much as smaller vendors.
But experts say don't panic too much -- you'll still find a tree. It just might cost you a few extra bucks.
RELATED STORIES:
The top five picks for Christmas trees
How to make your Christmas tree last a long time
Official White House Christmas Tree welcomed by Trumps
PHOTOS: The National Christmas Tree through the years