My view is there are not many of these things out there ( less in your area, maybe 3 from border to Newport ) and I am convinced they come down right to a place they find " tolerable " and skirt along river corridors just above normal human access or use. The cycle they likely follow in the colder climates must be large and in thick timber so the ice plate deposits from melt and refreezing cover a lot of their recognizable prints and destroy details that give it away. I believe Grassman58 on youtube has found a few suggestive trackways over the years. Being close to edge habitat for deer, elk and remote valleys with running waterways would be priority.
My only guess would be they reduce activity massively, perhaps have some caches and operate at on deficit until snow breaks up. I would not be surprised to find out one day they can reduce their metabolic rate in the colder months, some form of torpor but not true hibernation. I have heard some far north native tribes are reported to have this ability to a degree. I could see them taking advantage of shafts and shallow cave systems but I want to know why we don't find preserved tracks in the cave floor if that is the case.
There are a variety of snow trackways from nearby your area and they tend to occur around periods of bad weather, one I remember was about a guy found a set of prints that crossed his property near the Priest River area and they led up hill to a mangled deer completely disemboweled and meat pulled from the body, he noted bloody butt marks, hand prints and knee prints in the snow around the carcass. This was back around 2008 or something, the tracks went up hill into timber through some nasty thick regrowth and the guys could not follow as the snow was bucketing down and night was falling. I met the guy and heard his story first hand at the Klondike Tavern in Laclede, WA just before he moved to Alaska ( Thorn Bay ).
I heard a similar story about someone finding snow prints up Dry Canyon Rd in 2014, tracks crossed the road and went up hill toward the north to south ledge above the river, I tried to get in touch with the witness but he was native and did not want people to think he was crazy so he would not get in touch with me.
I also got a report of a snow trackway behind Freeman Lake in February of 2017, guys brother told me a little about it but said that he would not talk to anyone as he was a totally recluse.
The other factor is that people out in these more harsh environments and remote properties are generally tight lipped and don't like to share. They know stuff and you don't and they want to keep it that way.
To just touch on the coast for a second, I have loads of data here that seems to indicate they are still moving through their core habitats and visit throughout the year, as noted in another thread. They seem to drop below the holding snowline and hang out in wet thick crap on the edge of big timbered slopes that border a variety of habitat types and resources, they then cycle through a kind of loop along preferred paths over the course of a couple weeks and return to the starting point.
Outside of the coastal states, your guess is as good as mine honestly but we still get the occasional snow trackway in the dead of winter so my question would be, how is it happening if they go coastal? This where I am with the question and that is what I have come across in my 4 years investigating the Selkirk area and it did not add up to much.
I 100% agree, if you can solve the winter strategy in snow holding areas then you can really move the ball forward.