I have 4 chicks between 3-4 weeks old. I've had them outside with the top of their crate covering them and open to the ground and, once it was completely finished, also in their covered run. They love it. Can they stay outside overnight now? I live in the Boston Metrowest area. Our temps today are going to be in the low 80s during the day with a low of 57 overnight. I have a BR, an orpington, an easter egger, and a NH.