I just finished fermenting a lager in my bulkhead here in MA. I started in November and even though we had some warmer days, they never lasted long enough to really raise the temperature in the secondary. Not sure about Oregon, but my bukhead temps will probably get above 50 degrees in the next two weeks so you might just want to consider the length of time you will do it.
If you are planning some brews for next year, brew some lagers around Thanksgiving and let them ride out the winter. They will do great in the garage!
"It is sheer folly to be taken by the hand and led down the path of better brewing by someone who says that they know it all. No, it is your experience that counts most. It is your experience that will always lead you to more questions."