A week ago? It was wickedly cold before then. Birds don't hang around hoping that you'll remember to put feeders out. I have feeders out all year.....they get to know that there's always going to be food there. It's a job but if you want birds around, that's what you have to do. I also throw left over toast or stale bread out on the deck which brings in the jays, cardinals, mourning doves and squirrels.
edit: Oops, just read Burt's post....spot on.