It is suppost to snow tonight ALOT in Chicago, very cold. I added a tarp to the run and a water heater to keep the water from freezing. did that two weeks ago ahead of time. I also just added a game cam to keep an eye on the chickens. I am planning to see how they react to the snow tonight and tomorrow. i was also predicting to still free range them with snow or no snow, their decission if they want to go out or not. For now I would call my coop pretty snow and weather proof for the winter. Gonna be interesting seeing them react to this cold and snow here in the windy city. Good luck to your chickens this winter!