Chicken Molt Calculator
Enter the date your hen started dropping feathers, how heavily she is molting, and her age to estimate how long the molt will last and when she should be back in lay.
Return to layEnter the date the molt started
How long do chickens molt and not lay eggs?
A molt is a full replacement of the feather coat, and it is expensive. Feathers are roughly 85% protein, so a hen pours everything she has into regrowing them and egg production stops almost completely while she does. Most hens are through it in 8 to 12 weeks.
The single biggest factor is whether she is a fast or a slow molter, and the answer is counterintuitive. A hen who drops a shocking amount of feathering all at once and looks briefly terrible is a fast molter — she will be finished in 4 to 6 weeks and is usually one of your better layers. A hen who sheds a few feathers at a time and never looks especially bald can drag the process out for three or four months. Early, slow molters are typically the poorer producers in a flock.
Age then adds to it. A hen in her second year bounces back faster than one in her fourth, and older hens come back into lay at a lower rate than they left it. If you are not sure how old your birds are, the chicken age calculator will work it out from a hatch date or from comb and leg condition.
When it is not a molt
Feather loss in a bird under about 15 months is usually a juvenile feather change rather than a true annual molt, and those birds often keep laying right through. Bare patches that appear only on the back or behind the neck are more likely a rooster over-mating her or flockmates feather-picking, not a molt. Sudden feather loss with visible skin irritation points at mites or lice. A genuine molt is symmetrical, starts at the head and neck, and works backwards.
If your hens have stopped laying and you are not seeing dropped feathers at all, molting is not your answer — start with why did my chickens stop laying, and see keeping chickens laying in winter if it is the dark half of the year.
Feeding through a molt
Switch from a standard 16% layer feed to something in the 18–20% protein range for the duration, or supplement with a high-protein treat. Cut back on scratch and corn, which dilute protein exactly when she needs it most. Handle her as little as possible: new pin feathers have a live blood supply and are genuinely painful. Do not add artificial light to push her back into lay during a molt — she needs the break, and forcing it shortens her productive life.
How we calculate it
Molt length by type: fast 4 to 6 weeks, typical 8 to 12 weeks, slow 12 to 16 weeks. One week is added for each year of age past the second, capped at four, since older hens take longer to return to lay. Return-to-lay dates count forward from the molt start date.
Based on:
- Early molters shed a few feathers at a time and may take 4 to 6 months; late molters finish fast and are the better producers (Mississippi State Extension)
- Adult molt typically occurs in late summer or autumn with regrowth complete in 8 to 12 weeks (Penn State Extension)
- Laying declines with age and after each annual molt (University of Minnesota Extension)
Figures are typical guidelines for planning. Your birds, breed, climate, and feed will vary.
Frequently asked questions
How long do chickens molt and not lay eggs?
A typical molt lasts 8 to 12 weeks, and most hens stop laying entirely for the bulk of it. A hard, fast molt can be over in 4 to 6 weeks; a slow, drawn-out one can run 12 to 16 weeks or longer.
At what age do chickens have their first molt?
The first true adult molt usually comes at about 16 to 18 months, most often in late summer or autumn as daylight shortens. Feather loss before that is normally a juvenile feather change, and those birds often keep laying through it.
How can I help a molting hen?
Raise the protein. Feathers are about 85% protein, so switch to a feed of 18–20% or add a high-protein treat, keep stress and handling to a minimum, and make sure they have clean water. Do not add light to force laying during a molt.