Not really :-) The coastal areas of the PNW are home to Anna's hummingbirds year round and there's many folks in coastal BC, western WA and OR and California that enjoy these little guys all year. We had a rather mild fall and my garden was still showing a lot of color until Thanksgiving so I'm not surprised you noticed their presence later than normal. Once they find suitable foraging material, they tend to visit often and the later in the season it got, the more appeal your feeder took on.

In my garden, I tend to do just the opposite from you......I put my feeder UP in fall and take it down in midspring. I've got more than enough nectar choices to keep them happy and hanging around during the growing season but like to supplement even my winter blooming hummingbird plants with a feeder during the offseason. And since it is hanging right in front of my dining room window, it gives me something to look at when the garden generally doesn't have a lot to say for itself :-)

The image of these little guys perching in my icy, snow-covered coral bark maple tree is winter picture worth more than a thousand words!!

ps. they are heavy insect feeders as well, obtaining a lot of needed protein from this source, so I tend not to do much fall garden clean-up so as to keep them and my other feathered visitors well-fed through the winter.