Are you losing leaves quickly or have you already lost all your leaves? This may be a serious issue, could there be something going on besides fall? Every year seems to be different but if you have noticed some of your trees leafing out earlier and has a history of this you should call an Arborist. Not a tree person but a real certified arborist, and if you can find one with more designations such as RCA, BCMA or college degree the chances for getting accurate up to date info is substantial. Trees on your property become part of the family treat them as such with professional help.