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Most failed hatches come down to six causes, in this order: wrong humidity, temperature off (usually an inaccurate thermometer), infertile, old or shipped eggs, opening the lid during lockdown, power or heat swings, and bacterial contamination. If it's day 21 and nothing has happened, don't give up yet: wait until day 23 for chicken eggs and candle before discarding anything.
Diagnose a failed hatch by symptom
Find the row that matches what you saw and apply the fix before your next set. The first cause listed is usually the more common. Candling records and an egg autopsy confirm which row you're really in, because "didn't hatch" can mean anything from never fertile to died at the last minute.
| Symptom | Likely cause | Fix next time |
|---|---|---|
| Clear eggs at day 7 candling | Infertile eggs (no rooster, too many hens per rooster, very young or old rooster), or eggs stored too long, too cold or too warm before setting | Crack a few eggs from the flock to check for fertility. Set eggs under 7 days old, stored at 55–65°F pointy end down |
| Blood ring at candling | Embryo started, then died in the first few days: temperature swings, rough handling or shipping, old eggs | Verify temperature with a second thermometer. Run the incubator 24–48 h before setting. Set fresher eggs |
| Early deaths, days 1–7 | Temperature too high or low, long or poor storage, eggs not turned, jarring during shipping | Calibrate the thermometer, keep the room at 65–75°F, turn 3–5 times a day from day 1 |
| Mid deaths, days 8–14 | Temperature drift or a long power cut, missed turning, contamination, poor breeder-flock nutrition | Check for hot or cold spots, use an auto turner, feed the breeder flock a complete layer or breeder ration |
| Fully formed chick dead in shell, no pip | Humidity too high through incubation (air cell too small), temperature off in the last week, poor ventilation, chick malpositioned | Track air-cell size or egg weight. Aim for about 12–14% weight loss by day 18. Keep vents open at lockdown |
| Internal pip but no external pip | Humidity wrong (too high or too low), low temperature, chick too weak or poorly positioned | Hit the weight-loss target. Raise humidity to 65–70% at lockdown and keep the lid shut |
| Pipped, then died | Lid opened during hatch (humidity crash), humidity too low at lockdown, overheating, poor airflow | Don't open the lid during lockdown. Check temperature at egg height. Make sure vents are open |
| Shrink-wrapped chick (dry membrane stuck tight) | Humidity too low during lockdown, or the lid was opened after pipping and membranes dried | Raise lockdown humidity to 65–70% before day 18. Plan so you never need to open the lid mid-hatch |
| Sticky or gooey chicks smeared with egg contents | Average temperature slightly low and/or humidity too high, sometimes poor turning | Verify temperature, lower humidity during days 1–17, turn consistently |
| Hatched early (day 19–20) | Incubator ran hot. Small eggs also hatch a little earlier | Check against a calibrated thermometer at egg height. Don't add heat when the display dips after setting |
| Hatched late or drawn out over days | Incubator ran cool, hot and cold spots, eggs of very different ages or sizes, long storage | Calibrate, use forced air, set eggs of similar age and size, don't store eggs longer than 7 days |
| Large, soft, mushy-bellied chicks | Humidity too high, low temperature, poor ventilation. Smelly, wet, inflamed navels point to a bacterial navel infection | Lower incubation humidity. Disinfect the incubator between hatches and set only clean eggs. See a vet about sick chicks |
| Unhealed or open navels | Temperature too high or fluctuating, humidity too high | Verify temperature. A small dry scab is normal: don't pick at it |
| Splayed legs or crooked toes | Slippery hatching floor, temperature too high or low, breeder-flock nutrition | Put non-slip shelf liner or mesh on the hatching floor. Verify temperature |
| Exploded or rotten eggs | Bacteria entering through dirty, washed or cracked shells, or a dirty incubator | Set only clean, uncracked eggs. Disinfect between hatches. Remove any egg that smells or oozes immediately |
If several rows apply, check humidity and temperature first: they cause most problems and both are easy to mismeasure. The incubator humidity guide shows how to judge humidity by egg weight instead of a single hygrometer reading.
Rotten eggs can burst. Gently remove any egg that smells, oozes or candles dark and blotchy with no structure, before it contaminates the others.
Day 21 and nothing happened: what to do now
Wait. Chicken eggs often hatch a day or two late, especially if the incubator ran cool, the eggs were stored before setting, or the power went out. Keep the lid closed and humidity at lockdown levels until day 23; give other species the same 2-day grace period.
1. Check your dates and your thermometer
Day 0 is the day you set the eggs, not day 1. Recount using the hatch date calculator. Then put a second, calibrated thermometer at the top of the eggs. If it reads 98°F, development is slower and a late hatch is likely.
2. Candle the eggs
Candling is the safest way to check for life. Work quickly in a dark room. A living late-stage egg is dark except for the air cell, and you may see the chick move or see the shadow of a beak inside the air cell (an internal pip). An egg that looks the same as at day 14, with a sharp, flat air-cell line and no movement, has probably stopped developing. Our candling guide shows what each stage looks like.
3. Be careful with the float test
The float test (watching eggs in warm water for movement) is widely used but risky: it chills the eggs, can let water into a pipped or cracked egg and drown the chick, and a still egg isn't necessarily dead. Candling tells you more without the risk.
4. Decide
Remove eggs that are clearly rotten. Leave any egg you're unsure about until day 23, then open the rest to find out why (see the egg autopsy below).
When (and how) to help a chick hatch
Help only when a chick has made no progress for 24 hours after its external pip (the first hole or crack in the shell). Before that, a resting chick is normal: it's absorbing the last of the yolk and closing off the membrane's blood vessels, and pulling it out early can make it bleed.
Signs a chick is in trouble
- No new cracks or "zipping" around the shell for 24 hours after the external pip.
- The membrane visible through the pip hole has turned dry, white or tan and papery, and is stuck to the chick (shrink-wrapped).
- Peeping that was strong is getting weaker or has stopped.
How to assist safely
- Prepare first. Wash your hands and have tweezers, a cotton swab and warm water ready. Every minute outside the incubator dries the membrane.
- Wrap the egg in a warm, damp cloth, leaving the pip hole exposed.
- Chip small pieces of shell starting at the pip hole and working toward the blunt end, around the air cell. Don't remove shell over the lower part of the egg yet.
- Moisten the membrane with the damp swab. A wet membrane turns translucent so you can see the blood vessels, and it releases the chick more easily.
- Stop at any bleeding. If you see red, active veins or a drop of blood, put the egg straight back in the incubator and wait several hours before trying again.
- Free the beak and head, then stop. Return the egg to the incubator with humidity still high (65–70%) and let the chick push itself out. It needs to finish absorbing the yolk inside the shell.
Be realistic. Many chicks that need help have another problem: they were malpositioned, weak, or affected by the same temperature or humidity issue that slowed them down. Some assisted chicks do well. Others have unabsorbed yolk, leg problems or infections and don't survive the first week. If a chick is struggling after hatch, a vet who sees poultry can advise you.
Breakout: the post-hatch egg autopsy
Opening unhatched eggs shows you when each embryo died, which points straight to the cause.
How to open eggs safely
- Work outdoors, away from food, kids and pets. Wear disposable gloves; eye protection is sensible.
- Hold each egg inside a plastic bag or over a bucket, and point it away from your face. Rotten eggs are under pressure and can spray.
- Tap the blunt end (the air cell) and peel the shell back from there. Tip the contents into a shallow dish to look.
- Bag everything for the trash, or bury it deep. Wash your hands thoroughly.
What you'll find, and what it means
| What you see | Approximate day of death | Points to |
|---|---|---|
| Small, solid white spot on the yolk; no ring | Never developed | Infertile egg |
| "Bullseye" ring on the yolk, or a red blood ring, no embryo | 1–3 | Storage, early temperature problems, shipping |
| Tiny embryo with a dark eye and blood vessels | 3–7 | Temperature, turning, storage |
| Recognizable chick shape, beak and claws, little or no down | 8–14 | Temperature drift, power cut, turning, nutrition |
| Down-covered chick, large yolk sac still outside the body | 15–18 | Temperature, humidity, ventilation |
| Full-size chick, yolk mostly absorbed, no pip | 19–21 | Humidity, malposition, lockdown temperature, airflow |
| Head at the small end, or beak not under the right wing | Late | Malposition: eggs set pointy end up, turning problems, temperature |
| Smells, gray-green or black contents | Any | Bacterial contamination |
Note the result for every egg. One late death is bad luck; half the eggs dying in the same window is a pattern with a cause.
Checklist for your next hatch
- Check the incubator with a second calibrated thermometer at the top of the eggs: 99.5°F (37.5°C) forced air, 101–102°F still air.
- Run it empty for 24–48 hours in a room that stays 65–75°F, away from sun, drafts and vents.
- Disinfect the incubator, turner and water channels, and let them dry.
- Set clean, uncracked eggs under 7 days old. Expect lower hatch rates from shipped eggs.
- Turn 3–5 times a day, or check the auto turner is moving, until lockdown.
- Judge humidity by results: weigh eggs or track the air cell, aiming for about 12–14% weight loss by day 18.
- Candle on day 7 and day 14 and write down what you see.
- At lockdown: stop turning, raise humidity to 65–70%, add non-slip liner, close the lid and leave it closed.
- Plan for outages: know what to do if the power goes out.
- Wait until day 23 before giving up, then autopsy every unhatched egg.
For the full method, see the step-by-step guide to hatching eggs in an incubator and our list of common first-time hatcher mistakes.
Frequently asked questions
Why didn't any of my eggs hatch?
When no eggs hatch at all, the cause is usually the eggs or the thermometer. Clear eggs at candling mean they were infertile or stored too long. If embryos developed and then all died, check the incubator temperature with a second calibrated thermometer, because built-in sensors can be off by 1–2°F, enough to ruin a whole hatch.
My eggs didn't hatch on day 21. Are they dead?
Not necessarily. Chicken eggs often hatch on day 22 or even 23, especially if the incubator ran slightly cool or the eggs were stored before setting. Keep the lid shut and humidity at 65–70% until day 23, then candle the eggs before you discard any of them.
How long can a chick stay pipped before I should help?
From external pip to hatch normally takes 12–24 hours for chickens and 24–48 hours for ducks. Consider helping a chick only when there has been no progress at all for 24 hours after its external pip, and stop immediately if you see bleeding.
What causes a shrink-wrapped chick?
A shrink-wrapped chick is stuck to a dried, tough membrane that it can't turn inside. It's caused by low humidity during lockdown or by opening the lid after eggs have pipped, which drops humidity in seconds. Raise humidity to 65–70% before lockdown and keep the lid closed until the hatch is over.
Why did my chicks hatch early?
Hatching on day 19 or 20 usually means the incubator ran hot, often by only a degree or two. Early chicks are more likely to have unhealed navels and leg problems. Check the temperature at egg height with a calibrated thermometer before your next hatch.
Does the float test tell me if an egg is alive?
Not reliably. The float test is popular, but it chills eggs, can let water into a pipped or cracked egg, and a motionless egg in water may still be alive. Candling in a dark room is safer and tells you more, including whether the chick has pipped into the air cell.