We are new chicken owners with 4 hens approx 23-24 weeks old. Three of the four are laying regularly, the fourth, an EE has not laid yet. Anyway, we live in Northern California, so we don't suffer the snowy winters that many of you experience. Still, not sure what changes I need to make to the coop to ensure the girls aren't cold during the winter. What type of temps can they handle without heat lamp, etc. We have a small coop with two nest boxes and an extended run off that. I let them out in the run during the day so they can go in and out and lock them into the coop at night to keep them safe from predators. There is little or no shelter in the run since the trees have been pruned back for the winter. I am guessing that on cold rainy days that I will leave them in the coop, but will they be warm enough? Do I need to change ground cover? I currently have sand in my coop, dirt in the run and shavings in the nest boxes. Any help you can provide would be appreciated.