My club here in Colorado Springs is open year round weather permitting.
We cover three greens in the winter that tend to get the most damage in the winter otherwise, and we use temp greens on those holes. Coincidentally they are the greens for all of our oar 5s.
We will not allow play until frost has melted. The greens typically get a nice coat of sand around 12/1 for the winter to minimiz damage.
I am also a member at Prairie Dunes in Kansas. The greens there are among the best anywhere. They go to temp greens for all 18 holes, or so I believe. Have never run out there in winter to play, it is a 6.5 hour drive.