I have 8 RIR's too, among others--today was the first day it was warm (using the term loosely!) enough to let them out of the coop. They have been locked up in the coop for four days with a heater because it was -20 at night and only about 5 during the day. Today, I went to the store and bought a cabbage and shoveled out an area in the run, and propped open the door. They all dogpiled up at the door until I picked them up one by one (lazy buggers) and placed their delicate selves right next to the cabbage. Oh! A cabbage! Wonderful! They didn't last long initially and cruised back to the coop, but I have been watching them from the house and they are going back and forth now. My husband is going to shovel out a bigger area later. I haven't vaselined their combs yet--they were plenty warm in the heated coop (about 30 degrees at night). I would let them out if its over 25 degrees. But they will do what ever the heck they want to anyway!