What week do chickens start laying eggs? My chickens are 15 weeks old. What week is the earliest and what week would be the latest? I have 5 RIR, 2 Buff Orpingtons, and 3 Barred Rocks. Do I need to put golf balls in the nest or some other type of fake eggs? The chickens are from the local feed store, so not sure if they are production RIR.