We three posters are all much akin in our growing zone so our experiences should be much the same. I have had pansies make it through the long winter to flower early in the spring. I have also lost all track of the pansies I'd planted when the cold came without benefit of a blanket of snow.
I seldom have my snapdragons survive our winters. Last year was an exception in that every snapdragon from my 2011 garden enjoyed the mild winter and is still in bloom today. Even with a snow coat I seem to lose most of the snapdragon plants. I suspect they die out in early spring when the sudden warmth gets them started growing too soon rather than because of cold weather in winter.
Love, Smart Red