3 Breeds of hens and ALL stopped laying at same time-it's been almost 4 months! Help!!!!

I would increase their light time again. Mine have been laying with additional light since I added it in October, but some are still moody and not laying so well.

 

Along with adding more light, I would suggest you add more heat, meaning put an old heater inside the coop. During the colder months, chickens slow down their laying cycles due to the loss of daylight and some feel uncomfortable laying in the cold. I added a light and heater to my coop and the laying cycles of my chickens started back to its healthy ways again!

 

I run 14 hours light per day, on at 4 am off at 6 pm I have got eggs all winter with no heat, but the winter here has been very mild.