Yeah I've noticed it too. Seems like some trees and plants go by the calendar and others go by the temps. So there were some trees that leafed up at the usual time and others that waited due to the cool spring. Similar for this fall. We have a Willow Oak that is a beautiful big old tree that is still dropping leaves, they are small and there's a billion of them, lol. Sweet Gum trees aren't done yet either, but they're all getting there. We usually are done with leaves here by the 1st of December.