Your older pullets should start just about anytime.
Laying is more determined by the length of the day, rather than the temperature. So, usually new pullets can start laying in the winter, but not always. Now as the days are lengthening, it should trigger them to start laying. It is usually recommended about 14 hours of light to stimulate laying.
I've waited till 33 and 35 weeks in years past.
Imp
ETA- Should also mention that laying and maturity can also depend some on breed.
Sorry, but your pullet has a little more to go. She'll probably lay in the next month or so. It's normal. It's winter. Orpingtons mature slow. I have a leghorn who are very early maturing breeds and she's 33 weeks, no eggs.
What they said! Chickens are on their own schedules, and I think they do it to mess with our heads! Give her some more time. Once the days really start getting longer, she will start laying for you. She does have a little longer to go in my oppinion...she's got some deeper shades of red to reach first
Suplemental light is your choice. Personally, I don't see the need to waste the electrcitiy for an eventuality that will happen reguardless of wether I throw money at it or not *shrug* Mine waited to just around 8 months to start laying, and a month later, I am still waiting for the straggler to begin...her comb tells me I will be waiting a while yet.
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