Normally the weekend following Thanksgiving, unless Thanksgiving is the last Thursday of the month then sometimes I decorate earlier that week.
This year might be different though, with getting my mom settled in a nursing home and doing all the goes along with that. Plus cleaning out her apartment. I'm hoping to have it done by Thanksgiving so we can turn the keys back over to her landlord. If it takes longer I might not do as much decorating for Christmas, and we may be having pizza instead of everything we normally have.