Take a look at the other posts down the line, like the one about the first egg countdown! Usually about 16-24 weeks old, depending on breed af bird and stuff! hehehe take a look, this is a great site!
Generally 17-24 weeks. Some lay a bit sooner, some later. Depends on the breed - some breeds are slower at maturing.
Quote:When your pullet begins with her first egg(s) expect the egg to be smaller and less frequent. Storey's Guide to Raising Chickens says one egg every three or four days . Your own chickens may vary. You will see them begin to lay more frequently and you will notice the eggs will get larger. Part of the frequency and size of the eggs depend upon the particular breed of chicken you are talking about. Your white rock is probably within a few weeks or month of laying -- perhaps a bit longer. Many 'hatchery' breeds are bred for egg laying. I think that the books say Plymouth Rocks lay 180 -200 eggs per year... so nearly every-other-day, once your hen is producing eggs regularly. Perhaps even more.