GuideEgg production · diagnostic

Why aren't my chickens laying eggs?

Six causes account for almost every backyard laying drop: short daylight, annual molt, age, a recent stress event, a nutrition shortfall, or hidden eggs. Walk through them in that order — daylight first because it is the most common, hidden eggs last because it is a search problem rather than a diagnosis. The cause is almost never disease unless the bird is also showing other symptoms.

The diagnostic question to start with: what changed in the last 2–4 weeks? A new bird, a hot stretch, a fall in daylight, a switch in feed brand, a coyote at the fence at dawn — one of those usually fits.

The six causes, ranked

Cause	When you see it	First fix
Daylight dropped below ~14 hours	Most common — fall + winter	Add a 30–40 W warm-spectrum LED on a timer to extend morning to 14–16 hours total. Or accept the natural pause.
Annual molt	Common — late summer through fall	Switch to a 20% protein feed for 6–8 weeks; keep oyster shell available; wait it out (8–12 weeks typical).
Stress event in the last 1–2 weeks	Common — situational	Identify and remove the trigger. Production usually recovers in 1–3 weeks once the stressor is gone.
Age (the natural lay curve)	Inevitable — year 2+	No fix. Rotate in younger pullets every 1–2 years if continuous production matters.
Nutrition shortfall	Less common but easy to miss	Layer feed at 16–18% protein as the foundation; oyster shell free-choice; treats no more than 10–15% of intake.
Hidden eggs	Common with free-range flocks	Confine to coop and run for 3–5 days. If eggs reappear, walk the property and find the cache.

Daylight: the photoperiod rule

Hens lay because daylight tells their pituitary to release the hormones that drive ovulation. The threshold extension publications settle on is roughly 14 hours of daylight to maintain production, 16 hours for peak. Below about 12 hours, most flocks slow or stop. That is why fall and early winter look like a flock-wide shutdown — September and October are when most of the country falls below the threshold.

You have two reasonable responses:

Let them rest. Hens evolved to pause through short days. A natural winter break correlates with longer useful laying lifespans in heritage breeds.
Add supplemental light. One 30–40 W warm-spectrum LED on a timer, set to add daylight in early morning so birds roost at natural sunset. Increase the timer no more than one hour per week. Aim for 14–16 hours of total light. Production usually returns in 2–4 weeks.

Skip cool-spectrum (blue-white, > 4000 K) bulbs. Hens respond to orange and red wavelengths; cool LEDs are weaker reproductive stimuli. Skip heat lamps as a daylight source — they are a fire hazard, not a production tool.

Annual molt

Almost every hen molts annually, usually in late summer or fall as daylight contracts. The flock looks ragged, the run fills with loose feathers, and production stops or drops dramatically while the bird redirects protein and calcium into new feather growth.

Duration is breed-dependent and individual:

Fast molters shed and regrow in 2–3 months. They usually return to better post-molt production.
Average molters finish in 8–12 weeks.
Slow molterscan take 4–6 months. They tend to be the better year-round layers — they molt slowly because they don't pause production as completely.

The intervention is feed, not anything dramatic. Switch to a 20% protein ration (game bird feed, broiler grower, or a labeled molting feed) for 6–8 weeks. Keep oyster shell free-choice. Watch for picking — molting hens with bare patches sometimes get pecked by flockmates, and a smear of vet wrap or saddles can save a fragile bird.

Age — the lay curve

Hens don't stop laying so much as taper. Rough numbers across standard backyard breeds:

Year	Eggs/year (typical)	% of peak
Year 1 (peak)	200–280	100%
Year 2	160–225	~80%
Year 3	120–180	~65%
Year 4+	60–140 (sporadic)	~35–50%

Sex-link production breeds (Golden Comet, Red Star, ISA Brown) peak the highest in year 1 — often 300+ eggs — then drop sharper than heritage breeds. By year 3 a sex-link is often laying less than a 3-year-old Plymouth Rock that started lower. Heritage breeds (Wyandotte, Australorp, Orpington, Plymouth Rock) lay fewer total eggs but stretch the curve longer, often into year 5–6 at meaningful rates.

The practical implication: if you want continuous egg production, rotate in 2–3 new pullets every 12–18 months. Older hens stay in the flock as long as you want them — they are productive composters, garden tillers, and bug patrol regardless of laying rate.

Stress events

Anything that spikes cortisol can stop laying within 24 hours. Common triggers:

Predator at the fence.Even a near-miss — a coyote, neighbor's dog, hawk pass-over — drops production for several days while the flock stays vigilant.
Heat above ~90°F. Hens divert energy to cooling. Production drops within a few hot days; the egg shape and shell quality can also degrade.
New bird integration. The pecking-order reset takes 1–3 weeks, during which the bottom-of-pecking-order birds often stop laying.
Move to a new coop. Expect 1–2 weeks before laying resumes, even with otherwise excellent conditions.
Broody hen harassment. A determined broody hen will hog the nest box and chase away other layers. The other hens often lay on the floor or stop entirely until the broody breaks. See the broody-vs-incubator decision if you want her to actually hatch a clutch.

The fix is the same in every case: identify the trigger, remove it where possible, and wait. Stress-driven laying drops are usually transient. If two weeks pass without recovery, look at the next cause down the list.

Nutrition shortfalls

The cause that gets missed most often is a slow-burn nutrition gap. Hens fed mostly on scratch grain, kitchen scraps, or pasture forage will under-eat protein and calcium for weeks before laying collapses. The signs are not dramatic — production just tapers and the shells get thinner.

Three things to check:

Is layer feed actually the bulk of the diet? Scratch grain, mealworms, treats, and table scraps should be no more than 10–15% of total intake. Above that, the layer feed gets diluted below the 16–18% protein threshold.
Is the oyster shell dish full? Hens self-regulate calcium intake, but only if the dish has something in it. An empty dish is invisible to the casual coop check.
Is the feed fresh? Open feed loses palatability and nutritional value within 4–6 weeks. Vitamins (A, D, E) degrade fastest. Hens reduce intake on stale feed, which drops laying by week 2–3.

Run the numbers for your flock in the feed amount calculator. Under-feeding by 20% is a slow path to thin shells and inconsistent laying, and it is easier to do by accident than to notice.

Hidden eggs

A surprisingly common scenario, especially with free-range flocks: hens are laying steadily, just not in the nest boxes. The flock looks healthy, eats normally, has bright combs and full vents — they are simply hiding the eggs.

The two-step diagnostic:

Confine the flock to coop and run for 3–5 days. If eggs reappear in the nest boxes within 48 hours, you have hidden nests and need to find them.
Walk the property at midday. Hens lay before mid-afternoon. Check dense brush, behind sheds, in tall grass, under porch stairs, in the barn, in any half-enclosed structure. Hens reuse hidden nests — once you find one, pulling the eggs and blocking access usually redirects the flock back to the boxes.

A different version of this problem: a rat, snake, dog, or even another hen is eating the eggs before you find them. Mark a few eggs with a date and check counts through the day; if eggs disappear after laying, you have a thief, not a non-layer.

When to call a vet

A laying drop alone, in an otherwise active and bright-combed bird, is almost never disease. The six causes above cover the vast majority of cases.

Treat it as a health question if the laying drop comes with any of:

Pale, shrunken, or dark-tipped comb (blood-flow or circulation problem)
Visible weight loss, listless posture, droopy wings, tail-down posture
Sneezing, watery or sticky eyes, gurgling breath, head shake
Swollen abdomen — possible internal egg-yolk peritonitis, often fatal without intervention
Visible parasites: red mites at the vent, lice on feather shafts, scaly leg mites
Diarrhea persistent for > 24 hours, or blood in droppings

For any of these, the right next call is an avian or livestock vet, or your county Cooperative Extension office. HatchMath covers diagnosis and management math; we don't cover veterinary medicine.

The 7-day diagnostic plan

Day 1. Count daylight hours. Below 12? Add light or accept the pause and come back in spring.
Day 1. Look at the run for shed feathers and check hens for bare patches. If yes: molt. Switch to 20% protein and wait 8–12 weeks.
Day 2. Confine flock to the coop and run. Watch for hidden-egg recovery over the next 3–5 days.
Day 2–3. Audit the feed. Is layer feed 85%+ of intake? Is oyster shell full? Is the bag less than 6 weeks open?
Day 3. List events of the last 2 weeks: new bird, predator scare, heatwave, move, dog visit, broody. Any stress event, wait 1–2 more weeks for recovery.
Day 4–7. Watch for the second-symptom indicators above. None? Wait. Any? Vet.
Day 7. Re-evaluate. If still nothing on the list fits and birds look healthy, age may be the answer — they are quietly entering year 2+ slowdown.

Frequently asked

Why did my chickens suddenly stop laying eggs?

Sudden stops almost always trace to one of three triggers: daylight dropped below ~14 hours (most common in fall and early winter), the flock entered annual molt (typically late summer through fall), or a stress event hit in the last 1–2 weeks (predator scare, new bird added, heatwave, move). Less commonly: a nutrition gap from too much scratch grain, broodiness, or hens hiding eggs somewhere outside the nest box. Run those in order — daylight check first, then molt check (look for feathers in the run), then think about what changed.

How many hours of daylight do hens need to lay eggs?

Hens need roughly 14 hours of daylight to maintain steady production, with 16 hours being the standard target for peak laying. Below ~12 hours, most flocks stop or drastically slow laying — that's why production naturally crashes in September and October as fall photoperiod drops. Supplemental lighting (a 30–40 W warm-spectrum bulb on a timer) restores production within 2–4 weeks if you choose to use it. Some keepers prefer to let hens take the winter off as a natural rest.

How long does the annual molt last?

Most backyard hens molt for 8–12 weeks. Slow molters can take 4–6 months; fast molters finish in 2–3 months. Production usually stops entirely during active molt because the hen redirects protein and calcium to feather regrowth. Bump feed to a 20% protein ration during molt, keep the oyster shell available, and expect laying to resume gradually as the new feathers come in.

At what age do hens stop laying?

Hens don't really stop — they slow down. Year 1 (the first laying year) is peak: 200–280 eggs depending on breed. Year 2 drops to about 80% of peak. Year 3 drops again to roughly 60–70%. By year 4+ most hens lay sporadically — a few eggs a week, weeks-long pauses. Heritage breeds slow earlier than production hybrids; sex-link layers burn bright then drop fast. None of this is a problem to fix; it's the lay curve.

Could my hens be laying eggs somewhere I can't find?

Yes, and it's more common than people expect — especially with free-range flocks or hens that have access to a barn, woodpile, or shrubbery. Confine the flock to the coop and run for 3–5 days. If eggs reappear in the nest boxes, you had hidden nests; walk the property and look in dense brush, behind sheds, under deck stairs, in tall grass. Also possible: a rat, snake, or dog is taking eggs before you find them. Mark a few eggs and check whether the count is stable through the day.

Should I add supplemental light to keep hens laying through winter?

It's a tradeoff, not a clear yes. Pros: steady eggs through the dark months, the supplemental-light setup is simple (one timer, one warm-bulb 30–40 W LED). Cons: hens evolved to molt and rest in fall, and many keepers prefer to honor that pause. Whether continuous lighting actually shortens useful laying lifespan or causes more late-year reproductive issues is debated rather than settled — extension and welfare-focused references are split, and clinical evidence is thinner than common keeper certainty. If you do supplement, add the light in early morning (so birds roost naturally at sunset) and increase photoperiod gradually, no more than 1 hour per week.

When should I worry that something is medically wrong?

Worry when a hen who was laying steadily stops AND shows other symptoms: pale/shrunken comb, weight loss, listless posture, droopy wings, sneezing, sticky discharge, swollen abdomen, or visible parasites (mites at vent, lice on shafts). A laying drop alone, in an otherwise active and bright-combed bird, is almost never disease — it's one of the six common causes. A laying drop plus any second symptom is a vet question, not a calculator question. Avian and livestock vets, plus your county Cooperative Extension office, are the right next call.

By Jimmy L Wu. Reviewed 2026-05-01. Photoperiod thresholds (14–16 hours, ½–1 foot-candle minimum) anchored on Penn State Extension and Mississippi State Extension. Molt duration ranges (2–3 / 8–12 weeks / 4–6 months) and the early-vs-late molter distinction follow Mississippi State Extension. Lay-curve year-over-year percentages reflect synthesized hobby and extension references for standard backyard breeds; sex-link and heritage divergences reflect 2026 breed catalogs and practitioner consensus, not a single peer-reviewed source. Not veterinary advice — for sick birds or any animal-health emergency, consult an avian or livestock veterinarian, or your county Cooperative Extension office.