From now until December your birds will molt. First sign will be feathers suddenly on the ground. Occasionally a bird will have a hard molt and the first sign is a half naked chicken.
Better layers tend to molt later, and quicker than lazy layers. Up their protein at this time. Switch to a higher protein ration if you aren't already feeding one. 18-22% is best. You can also give higher protein treats like scrambled eggs, cottage cheese and canned fish, but generally the higher protein ration is enough. Keep a separate bowl of oyster shells for the calcium needs.
Most hens will resume laying from December to March depending on when they molted, and if they are higher production breeds.