Working on the same type of project here on the west coast. No snow here, but rain and wind. I currently have chickens with Ducks and Geese(WH and Pilgrims ) on the way / ETA week of 4/16.
I plan on having a area that has sufficient space for bedding/nest, next stage out is a total secure w/ sand base (Top made of tin panels and Solid welded stock Dog kennel lined with 1/2" x 1/2" welded wire cloth w/ skirt. This area is for times that birds can not be let out in the yard ( nighttime lock up, bad weather, out of town, etc.)
I think a space like this would be good for you, because it would be easy to cover and keep clear of snow. My Day yard area so far has 5 ft high (2x4) welded wire w/ t posts spaced at 5ft intervals. I think my next step will be the 1/2" x 1/2" welded wire skirting along the perimeter. My current yard area is 25' x 30'. After that I was toying with the idea of putting hog panels on the perimeter, that might be overkill , but it would sturdy up the exterior fence line.
I have coyotes, hawks, skunks, raccoons. I think the skunks and raccoons are not a problem. But I am not sure if i will have loses to the coyotes and hawks. Maybe you should look into getting a LGD. I look on Craig's list, but am holding back because I rent.