Well I've unpgraded my chickens digs to a very large run/coop. They seem to really enjoy it, but then again it's been summer the whole time they've had it. I'm suddenly looking ahead and wondering whether they will need a more 'indoor' portion in the winter? Initially I was thinking it wouldn't really be required where I live. The coop is about 8 foot deep, maybe 10 wide and about 6-7 feet high. It has a roof that should be water proof, and a roost that would block most winds, but it's partially open on two sides. I live in Santa Paula CA, that's Ventura County. Doesn't really get cold here. How cold is cold for chickens?