Now is it okay if they have dew and frost on them? They looked like sad little icicles the other morning.
I would try to avoid them becoming frosty Popsicles. Do you have a coop that you can close up at night? It would be helpful to provide shelter to keep out the wind and hold in the heat. If you wish, take a bale of straw and peel off chunks to line the walls of your coop. It will help insulate the coop while filling in any large cracks and gaps. If you have a fenced in run, consider wrapping the sides with heavy plastic or vinyl as a wind break. Cold wind can cause more problems that cold temps, especially if animals are wet or icy.
Reading winter feeding, you can make a warm mash out of their feed, cook up warm oatmeal or provide some cooked pasta for extra calories and a little warmth. You can provide scratch if you want to increase their calorie intake and help them gain a little wight and body fat. You can even add one capful of Red Cell to a gallon of their water for an extra vitamin and mineral boost.
May I ask what state you are in? I hear that we are going to have a cold winter in NY.