Last year was my first winter with chickens and it was a whopper of a winter to say the least. What saved my birds was my roofed and tarped run. I put clear poly tarps on all 4 sides of my run. Most days I kept the front one rolled up so they got fresh air, but if we were getting snow I'd lower it. It was blizzard conditions outside but my girls were happily scratching in their run. Definitely go with clear tarps to let the sun in.
I agree with others in thinking your coop is much too small. It's good that you are looking for ways to keep the run usable during the winter. It's even more critical that they have that space.
I'd look at buying or building a more adequately sized coop as soon as you can. Until then perhaps modify your existing one. Maybe remove the floor of the roosting area and enclose the entire structure. It looks like you'd more than double the available space and be able to provide more/longer roost space. You can also add some much needed ventilation.
After you've given them more coop space I'd suggest providing something in the run that allows them to use more of the space. Think up. Give them roosts in the run to hang out on. Maybe put a bench, table, or other platform in there so your birds can hang out at different levels. They'll be able to spread out more and their quarters won't seem as tight. It really makes a difference when they're snowed in and only have access to the coop and run.
I agree with others in thinking your coop is much too small. It's good that you are looking for ways to keep the run usable during the winter. It's even more critical that they have that space.
I'd look at buying or building a more adequately sized coop as soon as you can. Until then perhaps modify your existing one. Maybe remove the floor of the roosting area and enclose the entire structure. It looks like you'd more than double the available space and be able to provide more/longer roost space. You can also add some much needed ventilation.
After you've given them more coop space I'd suggest providing something in the run that allows them to use more of the space. Think up. Give them roosts in the run to hang out on. Maybe put a bench, table, or other platform in there so your birds can hang out at different levels. They'll be able to spread out more and their quarters won't seem as tight. It really makes a difference when they're snowed in and only have access to the coop and run.