Do Deer Jump Picket Fences?
Deer are capable of jumping fences that are as high as 8 feet (or more), so yes, they can get over a picket fence easily. Deer like to see where they will land. They are less likely to jump over a fence into a garden that has raised beds or those that have row covers or support structures such as tomato cages. You can find more information on deer deterrent options in the following University of Maryland publication.