We got our girls in the end of May 2008 - 1 each: BSL, RIR, and BR. They hit 20 weeks sometime in October but didn't start laying until Thanksgiving Day, 12/29, and 12/30 (respectively). They laid faithfully all winter. We have gotten eggs pretty much daily since that time. We didn't have extra light in the coop, live in the grey Pacific Northwest, but do have a clear roof on the coop.