Marilyn, they love frost and cold. Just not freezing cold and drying winds at the same time. If they are exposed (no snow cover) and you have wind (but no moisture), they will need a sip of water now and then.
We don't have to worry about the sip of water here in the PNW, with all our rain.
All of those frosty looking semps are doing very well right now. We are starting to slowly warm up, very slowly. The semps are starting to change color.
