New Year's Eve or New Year's Day.
This year, I have to work on New Year's Day, so it will be on NYE.
We do live trees, and put them up very early, so by New Year's, they are dead.

Deader than a doornail, as old Scrooge would put it.
We also don't do the whole 12 Days of Christmas/Epiphany thing, so to my house, when New Year's hits, the Christmas season is
OVER. Get all the crap down, pack it away,

bring on Valentines Day and the seed catalogs!!!

Yeah, I'm kind of all done with Xmas this year.
(It doesn't help that I have spent the last week unpacking Valentine's Day and Spring merchandise at work - most of the inside of JoAnn's looks like April.)