Mine usually stop in September sometime, after it's been wicked hot here from early June on. If they've had a predator scare or something traumatic the Hens may quit laying for a few days, but more than likely if they are out free ranging they are are being sneaky and laying outside somewhere. I sometimes leave mine locked in a full couple pf days to see how many of my Hens are laying, and then if I get more eggs on those 2 days than I normally get when I let the flocks out in the afternoons I end up having to go nest hunting
