Hatching chicken eggs at home is one of those jobs that looks simple until you actually try it. You put fertile eggs in an incubator, wait about three weeks, and expect chicks. In reality, the hatch depends on several small things staying right for a long time.
Temperature matters. Humidity matters. Turning matters. Ventilation matters. Even the way you store the eggs before they ever reach the incubator can change the result.
The good part is that you do not need to make incubation complicated. If you start with suitable eggs, set the incubator up properly, make a few checks at the right times, and avoid disturbing the eggs during hatch, you have already covered most of what a backyard keeper needs to do.
Chicken eggs normally hatch in about 21 days. A chick may arrive a little early or late, but a hatch that is consistently early or late can also be a clue that your incubator has been running too warm or too cool.
Start With the Right Hatching Eggs
You cannot fix a poor hatching egg with a perfect incubator. The egg itself matters from the beginning.
Choose eggs that are clean, normally shaped, uncracked, and close to average size for the breed. Mississippi State Extension specifically recommends average-sized hatching eggs and notes that very large, very small, cracked, thin-shelled, or misshapen eggs tend to hatch poorly.
I would also avoid heavily soiled eggs. It is much better to collect clean eggs from a dry nest than to try to scrub a dirty egg later.
And remember that an egg has to be fertile before incubation can do anything. The incubator does not create fertility. It only gives a fertile embryo the environment it needs to keep developing.
Should You Wash Hatching Eggs?
For a normal backyard hatch, I would not wash hatching eggs.
Eggshells are porous, and washing can remove some of the shell’s natural protective coating while also helping bacteria move through those pores. Mississippi State recommends starting with clean eggs instead of washing dirty ones for incubation.
If an egg has a tiny bit of dry loose debris, you can gently remove what comes away easily without wetting the shell. I would not try to rescue a heavily dirty egg for the same incubator as a batch of clean eggs.
How Long Can You Store Fertile Eggs Before Incubating Them?
Freshly laid fertile eggs do not have to go straight into the incubator, but hatchability gradually drops the longer they sit.
For a backyard hatch, try to set eggs within about 7 days when you can. Mississippi State notes that hatchability remains much better when eggs are set within roughly 7–10 days under good storage conditions.
Store hatching eggs in a cool place, not a normal refrigerator. Extension guidance places useful storage temperatures around 50–65°F, with about 60°F often used as a practical target. A humid storage area also helps reduce moisture loss.
If you are holding eggs for several days, gently change their position once or twice a day. You do not need to treat storage like full incubation, but leaving eggs sitting in exactly one position for a long period is not ideal.
Get the Incubator Running Before You Set the Eggs
Do not load fertile eggs into a cold incubator and then start experimenting with the controls.
Run the incubator ahead of time so you know it can hold a steady temperature. Mississippi State recommends starting the machine a day or two before setting eggs. That gives you time to adjust the thermostat, fill the water channels, check the fan if it has one, and make sure your thermometer and hygrometer are giving believable readings.
Clean the incubator before every hatch. Old shell pieces, dried membrane, chick fluff, and residue from the previous batch are not something you want around a fresh set of eggs.
If you still need an incubator, keep the buying decision separate from the incubation process itself. Our egg incubator guide covers the equipment side in more detail.
Forced-Air vs. Still-Air Incubators
The first thing to know about your machine is whether it has a fan.
A forced-air incubator uses a fan to move warm air around the eggs. That helps keep the temperature more even from one part of the incubator to another.
A still-air incubator has no circulation fan, so warmer air naturally rises. That is why the temperature is normally set a little higher and why thermometer position matters more.
For chicken eggs, Mississippi State recommends about 100°F in a forced-air incubator and about 102°F in a still-air incubator. Many modern home incubators are designed around 99.5°F, so always check your manufacturer’s instructions as well.
Do not chase every tiny fluctuation by constantly adjusting the thermostat. A machine that is being opened, closed, and reset every few minutes can end up less stable than one that is left alone.
Humidity During the 21-Day Hatch
Humidity is where backyard keepers often get conflicting advice, partly because incubator design, local climate, and measuring equipment can differ.
Mississippi State uses about 58–60% relative humidity during the first 18 days and at least about 65% during the final three days. Some home incubator manufacturers recommend a lower starting humidity, so use your incubator manual as the first reference for that machine.
The air cell gives you another useful clue. As the embryo develops, the egg slowly loses moisture, and the air cell becomes larger. If the air cell looks too small for the stage of incubation, humidity may be running too high. If it is growing too quickly, conditions may be too dry.
A hygrometer is useful, but do not forget that a cheap inaccurate hygrometer can make a perfectly good incubator look wrong. If your hatch results repeatedly seem off, checking the accuracy of both temperature and humidity instruments is worth doing.
How to Place Eggs in the Incubator
If your incubator holds eggs upright, place them with the large end up and the small end down. The air cell is at the large end, and the developing chick normally positions its head toward that end before hatching.
If the eggs lie on their sides, keep the large end slightly higher when your incubator design allows it.
Before setting the eggs, let cold stored eggs warm gradually toward room temperature. Putting very cool eggs straight into a warm humid incubator can encourage condensation on the shell.
Turning Eggs: Days 1 to 18
Turning keeps the developing embryo from remaining in one position against the shell membranes for too long.
If your incubator has an automatic turner, let it do the job according to the manufacturer’s setup. If you are turning by hand, Mississippi State recommends turning at least 4–6 times a day.
A simple pencil X on one side of the shell and O on the other can help you keep track. Use pencil, not marker.
Turn gently. The embryo and its early blood vessels are delicate, especially during the first week. You are rotating the egg, not shaking it.
Keep turning through day 18. After that, stop.
Candling Chicken Eggs
Candling is simply shining a bright light through the egg in a dark room so you can see what is happening inside.
Around day 7 is a useful time for the first check. In a developing egg, you should usually see a network of blood vessels and a darker embryo area. A clear egg with no visible development may be infertile, although dark-shelled eggs can be harder to read.
A distinct blood ring with no healthy vessel network can be a sign that the embryo died early.
A second candling around day 14 can help confirm development and let you check how the air cell is growing. By then, much more of the egg looks dark because the chick is larger.
Keep candling sessions short. You do not need to hold every egg outside the incubator for several minutes just to get a perfect view.
One old piece of advice I would avoid is adding new eggs halfway through the hatch if you remove clear ones. That creates two different incubation schedules in the same machine. The older eggs will need turning stopped and hatching humidity raised while the newer eggs still need normal turning and earlier-stage conditions. For a simple backyard hatch, keep one batch on one schedule.
What Happens Inside the Egg During the 21 Days?
The embryo starts developing long before you can clearly see it with a candler.
During the first week, the blood-vessel network expands quickly and the basic body structures begin forming. By the second week, the embryo is much easier to see and the egg becomes darker when candled.
During the final week, the chick takes up most of the available space. It gradually moves into hatch position with its head toward the large end of the egg and the air cell.
That is why the final few days are different from the rest of incubation. The chick is no longer simply growing. It is preparing to breathe air and hatch.
Day 18: Lockdown
Backyard keepers often call the last three days lockdown.
On about day 18, stop turning the eggs. If you use a removable automatic turner, follow the incubator instructions for disabling or removing it. Raise humidity to the hatching range for your machine and make sure ventilation openings stay clear.
Do not close the vents just to push humidity higher. The embryo needs more oxygen as hatch approaches, not less.
After lockdown, leave the incubator alone as much as possible. Every time you open it, you lose heat and humidity. One quick opening may not ruin a hatch, but repeatedly checking eggs because you are impatient can make the environment much less stable.
Pipping, Zipping, and Hatch Day
Hatching is not one quick crack of the shell. It happens in stages.
First, the chick breaks into the air cell inside the egg. This is called the internal pip. You may hear faint peeping before you see anything on the shell.
Next comes the external pip, when the chick makes the first visible hole in the shell.
After that, the chick gradually works around the shell, making a line of cracks. That is often called zipping. Once enough of the shell has been weakened, the chick pushes free.
This can take hours. A chick may pip and then rest for a long time. That pause is not automatically a problem.
Should You Help a Chick Hatch?
In most cases, no.
It is difficult to watch a chick pause after pipping, especially during your first hatch. The temptation is to start peeling shell away. The problem is that a chick may still be absorbing yolk or have active blood vessels in the membrane.
Utah State Extension notes that attempts to free chicks from the shell are usually unsuccessful. Unless you are dealing with a specific situation under experienced guidance, routine hatch management is to let the chick do the work.
The best help you can usually give is stable temperature, enough humidity, good ventilation, and patience.
When Should You Remove Chicks From the Incubator?
Leave newly hatched chicks in the incubator until they are dry and fluffy.
A wet chick can chill quickly if moved too soon. Once the chick is dry and active, you can move it into a brooder that is already warm and ready.
Residual yolk supports the chick around hatch, so you do not need to panic if it does not eat immediately. But once the chick is in the brooder, clean water and complete chick starter should be available.
Do not leave newly hatched chicks sitting for days just because they technically have yolk reserves. Move dry chicks to proper brooding conditions when it makes sense without repeatedly opening the incubator during an active hatch.
Our brooding chickens guide covers temperature, bedding, feed, water, and first-day care after the hatch.
Why Some Eggs Hatch Early or Late
A chick hatching on day 20 or 22 is not automatically abnormal. There is some natural variation.
But if most of your chicks hatch early, your average incubation temperature may have been too high. If the entire hatch is late, the incubator may have been running too cool.
That is one reason a hatch log is useful. Write down the day you set the eggs, your temperature and humidity targets, when you candled, when you stopped turning, and when the first and last chicks hatched. If the next batch has the same problem, you have something real to compare.
Common Reasons for a Poor Hatch
When a hatch goes badly, there is rarely one universal explanation. Timing gives you useful clues.
| What you notice | What to check |
|---|---|
| Many clear eggs at day 7–10 | Fertility, breeder health, egg age, storage conditions |
| Blood rings or early embryo death | Storage, temperature swings, sanitation, breeder nutrition |
| Many embryos die later | Temperature, humidity, turning, ventilation |
| Chicks pip but do not hatch | Humidity, ventilation, turning, malposition |
| Most chicks hatch too early | Incubator may be running too warm |
| Most chicks hatch late | Incubator may be running too cool, or eggs may have been stored too long |
| Weak or malformed chicks | Temperature, humidity, turning, breeder nutrition, heredity |
One bad egg does not prove the whole incubator was wrong. Look for patterns across the hatch.
A Simple 21-Day Chicken Egg Incubation Schedule
| Days | What you do |
|---|---|
| Before day 1 | Choose clean fertile eggs, store correctly, clean and pre-run incubator |
| Days 1–6 | Hold stable temperature and humidity, turn eggs regularly |
| Around day 7 | First candling check |
| Days 8–13 | Keep conditions steady and continue turning |
| Around day 14 | Optional second candling and air-cell check |
| Days 15–17 | Continue normal incubation and turning |
| Day 18 | Stop turning, raise hatching humidity, keep vents open |
| Days 19–21 | Leave incubator closed as much as possible and watch for pipping |
| After hatch | Move dry chicks to a warm prepared brooder |
FAQs About Incubating and Hatching Chicken Eggs
How many days does it take a chicken egg to hatch?
Chicken eggs normally hatch in about 21 days. A chick may hatch a little earlier or later, but consistently early or late hatches can indicate that the incubator has been running too warm or too cool.
What temperature should a chicken egg incubator be?
For a forced-air incubator, about 99.5–100°F is a common target. Still-air incubators are usually run warmer, around 101–102°F. Follow the instructions for your specific incubator because sensor placement and design can affect the correct setting.
How often should you turn chicken eggs?
If you are turning by hand, aim for at least 4–6 turns per day. Keep turning through day 18, then stop for the final three days before hatch. Automatic turners handle this for you when they are set up correctly.
When should you candle chicken eggs?
Around day 7 is a useful time for the first candling. A second check around day 14 can confirm development and help you judge air-cell growth. Dark-shelled eggs can be harder to read, so avoid removing a questionable egg unless you are confident it has stopped developing.
What is lockdown when hatching chicken eggs?
Lockdown is the final three days, starting around day 18. You stop turning, raise humidity to the hatching range recommended for your incubator, keep ventilation open, and avoid opening the incubator unnecessarily while chicks pip and hatch.
Should you help a chick out of the egg?
Usually no. Chicks often rest for hours between pipping and hatching. Helping too early can damage active blood vessels or interrupt yolk absorption. Stable temperature, humidity, ventilation, and patience are usually the safest approach.
Final Thoughts
The hardest part of incubating chicken eggs is often leaving them alone.
You set the temperature, check the humidity, turn the eggs, candle them, and then there comes a point where more handling does not help. By day 18, your job is mostly to keep the incubator steady and give the chicks time to finish the process.
Start with good eggs. Keep one batch on one schedule. Do not make constant adjustments because one reading moves slightly. And when hatch day finally arrives, remember that pipping and resting are both part of the process.
Once the chicks are dry, the incubator has done its job. From there, your attention moves to the brooder, where warmth, clean water, starter feed, dry bedding, and close observation matter all over again.
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