Update on using sand in the coop! With the snow and rain blowing, I have some wet sand by the entrance. The bonus is that the sand isn't going to disintegrate like pine chips, and doesn't stink like wet pine! The sand is fairly clean thanks to scooping the poop whenever I want (I have gone as long as about three days without scooping. It didn't have a bad smell), so I just stir the wet sand around a little, and just like at the beach, the sand starts drying. The snow and mud being tracked in doesn't cause an issue either. I still have some issues to work out (the rolled up tarp against the wall by the roost keeps forming poop pockets!) but I do like the sand.