Hens not laying need advice

The first thing that I would do is check them for lice. Some free ranged birds will get these bugs and usually require permethrin dust to get rid of them. This works for mites too if it's the case. Also, you hens may be slowing down right now. Being that spring is approaching, or should I say spring has approached, some chickens will stop laying for a while. My silkies did this earlier (about 2 weeks ago). Once the weather stabilized and stress levels had went down, all four of them began laying again. **stress could be another factor. Though you may not be for certain what is the cause, there are things you would not believe that could stress a chicken out. This includes birds flying over (lots of blackbirds), hawks flying overhead, and even certain vehicles driving down the road. Once one gen becomes stressed, almost every he becomes stressed. So what I would do is leave them in their coop until they are used to it, unless they are begging to get out, then just give them what they want.