New chicken owner here! I have four 23 week old hens (white leghorn, barred rock, 2 production reds). The white Leghorn and barres rock both have decent combs and waddles size and are pretty red. The leghorn has been making the “egg song” a few times in the morning but no eggs yet. They have been testing out nesting boxes and are more vocal. When should they start laying?!?!? I’m checking several times a day since they were 16 weeks old because I’m so excited! But still nothing! I’m wondering if it’s because we are now in winter?!?!? I live in the Phoenix Arizona area.