Get a bivy bag, and go tentless. You will need a tarp overhead to keep any snow off, and possibly to keep the wind off too. Depends on the site, slope, amount of snow, etc.
I hate sleeping in a cold nylon tent winter camping. It is a high humidity, frosty, clammy experience. With my -40 goose down bag and bivy bag, I like it "outside". The key thing is to totally get out of the wind. Absolute must. The tent is an advantage that way, but with some imagination, one can get a wind-free site, If the wind changes on you, you are scuppered, so that effects how well you chose your site. Best to be back in the bush. If going with the tent, definitely use the snow base. When I used to use a cold tent, I put a small poly tarp underneath it, between it and the snow, because your body heat will melt the snow under your thermarest. When sleeping under the tarp in my bivy and thermarest, I also use the small blue polytarp under the thermarest.
Even better is a hot tent and woodstove. But that’s for another thread.
Good luck.
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