If I'm home at Thanksgiving, the lights on my balcony go up on Thanksgiving Night. If I'm going out of town, I either put them up before I leave or wait till I get home.
I hesitate to have a tree anymore because I'm afraid it will be climbed. LOL
I also put out a lot of Christmas bric a brac, but I may have to rethink that since, as I noted in a different thread, my three kitties seem to view every flat surface in my apartment as yet another segment of The Track. LOL
There is a radio station here in Kansas City that started playing all-day Christmas music YESTERDAY. Blech. I think Thanksgiving is plenty of notice.
My parents never put up decorations before December 15. I'm not that much of a traditionalist, but I do find it ironic that even 100 years ago, most people waited until Christmas Eve to decorate and now there are wreaths and ribbons in the stores when it's still summer out. LOL