As a fellow citrus grower that lives in the PNW, your post is incredibly inspirational. I recall you having a satsuma I believe, has it faired decently? I also own one and have been considering planting it outdoors, but don't want to risk it dying over the winter so it's been potted for the past two winters.
My Satsuma did not survive, possibly because it was covered with a vinyl enclosure and that may have ended up creating a greenhouse effect that might have brought it out of protective dormancy during the winter. I thought it would help, but that might have been the thing that killed it. It was also a much colder winter than usual that year. It seemed like it was surviving, but then when Spring came and things started warming up, it became obvious the tree had died.
Jim_VH who lives two hours south of me in Vancouver has experimented with different types of Satsumas and has told me that the regular (Owari) Satsuma is not able to fully ripen its fruit in this climate, but some of the other earlier bearing varieties of Satsuma can. He also did an experiment and his Early St. Ann Satsuma tree did survive a mild winter, in his suburban neighborhood, without being covered that year, although the tree was pretty big, maybe between 4 and 5 feet in diameter and the same size high. (He ended up ripping the tree out after the experiment was over, he says it had grown too big for the spot it was planted in, and he normally has to cover it every year)
Maybe if it interests you to know, I have left out some seedlings grown from Satsuma seeds, on the patio near the house, and they did survive the winter. In health (hue of leaf color), they looked intermediate between the more cold hardy seedlings (like Yuzu), and regular citrus seedlings (some also managed to survive), which is not surprising. The hardier citrus seedlings managed to keep their old leaves from last year, the Satsuma did not.
Of course being on the patio deck near the house the temperatures probably did not get quite as cold as further away in the yard.
This was also a milder winter.
here is another related thread:
I think I have a hybrid of Ichangquat and 5* Citrumelo
http://tropicalfruitforum.com/index.php?topic=32683.0