Last year, my chickens would not come out of the coop until I got out there with a shovel and shoveled not only the ramp, but part of the run. We threw straw down over the snow in the run that I couldn't quite scrape out with a shovel because otherwise they wouldn't walk on it. It worked well, except that straw breaks down into a bit of a stinky mess in the mud and much of spring. This summer, my DH put a roof on the run, so I'm hoping that will keep the need to shovel to a minimum. Also, last year we covered the west and north sides of the run with a tarp and plan to do the same this year. I'm contemplating covering the lower half of the east side with thick plastic, but I'm not sure how much that will actually help to keep the snow out. What we'll probably do is cover the west and north sides as soon as it gets cold (it cuts the wind and makes it feel significantly warmer in the run) and wait for the first snow fall to see how much blows in under the roof.