I bought enough tarps, which were expensive here :-( to tarp their 16X20 run. Spent the whole day tarping, stapling, and shoveling snow, then reinforcing the outside where I stapled the tarps so the wind wouldn't rip them right off. added 2 bales of straw to the ground in the run because my chickens refused to step in that white cold stuff on their ground. gave them cottage cheese mixed with yogurt, warm scrambled eggs and peeled bananas to entice them to come out. then spent  a couple hours building them a water heater (since the fish tank heater I was using failed to keep the water from freezing at -4F) I know I did a lot more than this, but I went out there at 9 am and its 10 p.m now and apart form the trip to the hardware store and a couple breaks for food we worked in the barn until 8 p.m
once we did have it all tarped the girls were quite happy being out in the run. but I did find an issue with tarping a run....they now need a light out there :-/