When will my chickens start laying and will winter affect the timing

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Congrats on the 1st egg! We're in a similar situation. Around Christmas (at 5 months age) the girls' combs turned red & they started squatting when being pet. (BTW- In Northern IL, this winter's been especially brutal!) Two pullets started laying in the middle of the first Artic blast with -30'F temps, and each lay 5-6 eggs/week. The rest of the pullets now over 28 weeks have yet to give us a single egg. I never added supplemental light, since they weren't old enough to lay at the start of winter. They are Mutts / Easter eggers, so I have no breed info to go on. My husbands jokes if he's not going to get eggs for breakfast he'll be having chicken for dinner.