I'm in southeast Arizona, and have raised Australorps since 2008. If the chicks hatch in early spring (March) the pullets will start laying around October - then drop off until February or so. Grown hens lay almost year-round, but slowing way down around the winter solstice (Dec 21), then back with a vengeance around mid-January. They molt seemingly at random. I haven't tried using artificial light to extend the laying season, but my flock is 3-7 years old and still producing about 5 eggs per hen per week.