You waited 21 days.

You checked the temperature. Watched the humidity. Candled the eggs. Stared through the incubator window like it owed you money.

And then...

Nothing.

Or maybe something started developing and quit halfway through. Maybe you got all the way to hatch day and found fully formed chicks that never made it out.

A bad hatch sucks. It also immediately makes you start asking:

What the hell went wrong?

Unfortunately, failed hatches don't always hand us a neat answer. The same problem can have several possible causes, and one symptom doesn't necessarily prove what happened. But your hatch can still give you clues.

So instead of immediately blaming your incubator, your rooster, your humidity, yourself, or the phase of the moon, let's look at what actually happened and figure out what you should check before the next batch.

First: One Bad Hatch Doesn't Always Mean You Screwed Something Up

This is important. Chicken embryos are developing living things, and not every fertile egg becomes a chick. That doesn't mean incubation practices don't matter. They absolutely do.

Temperature, humidity, ventilation, turning, sanitation, egg storage, breeder health and nutrition, fertility, and genetics can all affect hatch success. But sometimes people finish one disappointing hatch and immediately start changing six things at once.

Don't.

First, figure out where in development things seem to have gone wrong.

That's much more useful.

The Eggs Stayed Clear

You candle around day 7 and see... Nothing. No veins. No dark spot. No tiny alien-looking chicken situation. It's tempting to immediately say: The eggs weren't fertile.

Maybe. But a clear egg tells you there's no visible development. It doesn't always tell you why. The egg may have been infertile. Development may have stopped extremely early. Egg age or storage conditions may have affected hatchability. And if the eggs were shipped, transit adds another entire pile of variables.

In other words:

Clear is an observation, not a diagnosis.

What Should You Check?

If these are eggs from your own flock and you're seeing a lot of clears, fertility is absolutely worth investigating. Instead of sacrificing your hatching eggs, crack a few fresh eggs from the same breeding group and examine the germinal disc for signs of fertility.

Also look at the breeding flock itself.

Are you consistently seeing poor fertility? Is your rooster actually breeding the hens? Is he older, injured, overweight, or having trouble mating? Are there feathering or size differences making successful mating difficult?

If the eggs were shipped, don't use clear eggs alone to judge the breeder's flock fertility. Shipping and storage can complicate the picture considerably.

We'll talk more about that in our shipped hatching egg guide.

Development Started, Then Stopped Early

This one hurts because you saw something happening.

Maybe you candled and saw veins, then checked later and development had stopped. You might see a blood ring or a small embryo that died during early incubation.

There isn't one universal reason for early embryo death.

Possible contributors include:

• Incubation temperature problems
• Improper turning
• Poor egg storage before incubation
• Breeder nutrition or health issues
• Contamination
• Genetics
• Ventilation problems
• Rough handling or shipping damage

This is why diagnosing a hatch from one dead embryo is so difficult.

But if you're seeing the same pattern repeatedly across multiple hatches, that's when the pattern becomes useful.

What Should You Check?

Start with the basics. Was your incubator actually running at the temperature you thought it was?

Was it stable? Were the eggs being turned properly? Was the incubator clean before you started? How old were the eggs, and how were they stored?

If you're using your own eggs and repeatedly seeing early losses across several hatches, start looking beyond the incubator too. Breeder nutrition, health, genetics, and flock management can affect embryo survival.

Don't assume every failed embryo means you need to turn the humidity knob.

Embryos Developed but Died Late

This is the particularly crappy version of a failed hatch. You open an egg after the hatch is clearly over and find a nearly or completely developed chick that never made it out. You were so close.

Late embryo death can have several possible causes, including incubation temperature or humidity problems, poor ventilation, incorrect egg position, improper turning earlier in incubation, contamination, breeder-related issues, and developmental problems.

Again, the chick itself may give you clues. But don't turn one dead-in-shell chick into a complete diagnosis of your incubator.

Look at the Whole Hatch Did this happen to one egg? Or twelve? Did most chicks hatch normally while one didn't? Were a lot of embryos at roughly the same developmental stage when they died? Did the hatch happen unusually early or late?

Patterns matter.

One weird egg can be one weird egg.

Ten eggs failing in a similar way deserve investigation.

Chicks Pipped but Didn't Hatch

Few things in incubation are more frustrating than seeing that first little hole in the shell and thinking: YES. HERE WE GO. And then...nothing. A chick that pips but doesn't complete the hatch may have encountered problems with humidity, ventilation, positioning, or other aspects of incubation and development.

One thing people sometimes do at hatch is close incubator vents because they're trying desperately to keep the humidity up. Don't suffocate your chicks in an attempt to keep them moist. Developing embryos need increasing amounts of oxygen as hatch approaches. Your incubator still needs proper ventilation during lockdown and hatch.

Humidity matters too. If conditions become too dry during hatch, membranes can dry and adhere to the chick, making movement and hatching more difficult. On the other hand, excessive humidity throughout incubation can prevent the egg from losing enough moisture before hatch. This is why humidity isn't simply: MORE WATER = BETTER HATCH.

You're managing moisture loss across the entire incubation period.

What About “Shrink-Wrapped” or “Drowned” Chicks?

Spend approximately seven minutes in a chicken group during hatch season and you'll hear both terms. They're useful shorthand. They're not magical autopsy results.

When people say a chick was “shrink-wrapped,” they're usually describing membranes that have dried and tightened around the chick. Low humidity during hatch can contribute to membranes drying and sticking.

When people say a chick “drowned,” they're usually describing a late-stage chick that appears to have had excessive fluid remaining in the egg. Excessive humidity during incubation can interfere with normal moisture loss. Those observations can help you troubleshoot. But don't assume the appearance of one egg proves exactly what your humidity was doing for the previous three weeks.

Look for patterns across the hatch.

The Hatch Was Really Early or Really Late

Chicken eggs generally hatch at around 21 days. Around is doing some work in that sentence. Not every chick reads the calendar. But if the whole hatch consistently runs early or late, pay attention.

A consistently warm incubator can push a hatch earlier. A consistently cool incubator can delay it. Old or improperly stored eggs and uneven temperatures within an incubator can also contribute to late or uneven hatches. That's why hatch timing is useful information.

If one chick pops out early and everybody else follows normally, don't rebuild your entire incubation system. If every hatch starts noticeably early?

Now I'm checking that thermometer.

And Don't Blindly Trust the Incubator Display

Your incubator saying it's running at the correct temperature does not necessarily make it so. Use an accurate independent thermometer to verify what's actually happening at egg level.

Because discovering after three shitty hatches that your incubator has been confidently lying to you is a special kind of rage.

Turning Matters More Than People Think

Developing eggs need regular turning during most of incubation. If you're hand-turning chicken eggs, turn them at least three times per day, preferably an odd number so they aren't spending every night resting on the same side.

Automatic turner? Congratulations. One less thing for your ADHD brain to remember.

Turning helps support normal embryo development and positioning. Improper turning can contribute to embryo death, malposition, and poor hatch results. And yes, stop turning for the final three days before the expected hatch. That's when chicks are getting themselves positioned for the big exit.

No more egg yoga.

Humidity Is Not One Magic Number

This one is going to piss off somebody on Facebook. There is no single humidity percentage that magically guarantees a successful hatch in every incubator, every house, with every batch of eggs. Incubator design matters. Ambient conditions matter. Egg characteristics matter.

The goal during incubation is appropriate moisture loss from the egg, which is why air-cell development can be useful information when evaluating whether things are progressing appropriately.

Humidity generally needs to increase for the hatching period, but blindly chasing somebody else's favorite number isn't the same thing as managing your hatch.

Follow the guidance for your incubator, understand what the humidity is actually doing, and pay attention to what your eggs are telling you.

Don't change humidity because Becky in a Facebook group lives three states away and swears 37.2% is the secret to chickens.

Becky does not live in your incubator.

Your Incubator Matters

Can you hatch chicks in a cheap incubator? Absolutely.

Can a quality incubator make your life a whole lot easier? Also absolutely.

A good incubator can't fix infertile eggs, poor storage, shipping damage, or problems that started in the breeding flock. But it can give you a more stable environment and remove some of the variables that make troubleshooting a bad hatch such a pain in the ass.

Look for an incubator that can reliably maintain temperature, provides adequate ventilation, is easy to clean, and lets you monitor what's actually happening inside. An automatic turner is also worth its weight in gold if you don't want to remember to turn eggs several times a day. And don't assume a fancy digital display means the incubator is always right.

Even with a quality incubator, verify the temperature with an accurate independent thermometer and learn how your particular machine behaves before trusting it with a pile of expensive hatching eggs.

The goal isn't buying the fanciest incubator you can find. It's using one that's reliable enough that when something goes wrong, you're not trying to troubleshoot the eggs and a machine that can't hold a steady temperature.

 

Don't Forget Ventilation

Temperature and humidity get all the attention. Ventilation is sitting in the corner wondering why nobody remembers it exists. Embryos exchange oxygen and carbon dioxide through pores in the shell. As development progresses, their need for oxygen increases. That means you should not seal up the incubator at hatch just because you're trying to hold humidity.

Follow your incubator's ventilation instructions and make sure vents aren't accidentally blocked. Humidity matters. So does breathing.

Some Hatch Problems Start Before Incubation

Sometimes we blame the incubator for problems that started before the eggs ever went inside it. Egg age and storage conditions affect hatchability.

If you're collecting your own hatching eggs, store them properly and avoid holding them unnecessarily long before setting. Handle hatching eggs carefully. And start with reasonably clean eggs from healthy breeding birds rather than assuming incubation can fix whatever happened beforehand.

The incubator isn't a time machine. It can't undo poor storage, significant damage, or problems with the breeding flock.

What If the Eggs Were Shipped?

Shipped eggs deserve their own conversation because shipping adds variables that don't exist when you walk eggs from your coop to your incubator. An egg can leave the breeder fertile and still fail to develop or hatch after transit.

Rough handling, vibration, temperature exposure, egg age, shipping time, and internal damage can all complicate the hatch. And some of that damage isn't visible from outside the shell.

So if your shipped eggs stayed clear or had a rough hatch, don't automatically conclude: The breeder sent me infertile eggs. And don't automatically conclude: I screwed up incubation.

There may be more going on.

If you're troubleshooting shipped eggs specifically, read our Why Didn't My Shipped Eggs Hatch? guide, where we get into fertility vs. hatchability, air-cell damage, shipping conditions, and what you can realistically control.

Assisted Hatching: Don't Let the Clock Make the Decision

Watching a chick pip and then seemingly do absolutely nothing for hours is torture. You will stare at it. You will walk away. You will come back 45 seconds later to see whether anything changed.

It didn't.

Unfortunately, impatience is not an incubation emergency. Chicks can spend a considerable amount of time resting during the hatching process. A certain number of hours after an external pip does not automatically mean a chick needs rescuing. Assisting too early can cause serious bleeding if blood vessels are still active or create problems if the yolk hasn't been fully absorbed.

So don't set a timer for 24 hours and start peeling shell because the internet told you that's Rescue Time. Before intervening, consider the entire situation. Is the chick breathing normally? Has it actually stopped progressing? What do the membranes look like? Are blood vessels still visible? Is there evidence that something is genuinely wrong?

Assisted hatching should be the exception, not the automatic next step because you're tired of waiting.

Sometimes helping saves a chick.

Sometimes helping too soon is the thing that hurts it.

Before Your Next Hatch, Check These Things

If a hatch went badly, resist the urge to randomly change everything. Instead, write down what happened. What percentage of eggs appeared to begin developing? When did development seem to stop? Was the hatch early, late, or spread out? Did chicks pip? Were there repeated malpositions? Did several eggs show similar problems?

Then check your equipment and process:

• Verify incubator temperature with an accurate independent thermometer.
• Make sure temperature is reasonably consistent throughout the incubator.
• Review humidity and air-cell development rather than focusing on one magic percentage.
• Confirm the eggs were turned properly.
• Make sure ventilation was adequate, especially near hatch.
• Clean and sanitize the incubator between hatches.
• Review how the eggs were collected, stored, and handled before incubation.
• If you're using your own eggs, consider breeder fertility, health, nutrition, age, and genetics.
• Keep records.

That last one is boring as hell.

Do it anyway.

A notebook full of hatch dates, settings, candling observations, hatch timing, and results becomes incredibly useful when you're trying to figure out whether something is a one-time fluke or a pattern.

Final Thoughts

A failed hatch makes you want an answer. Preferably one answer. This happened because of THIS. Unfortunately, incubation doesn't always work that way.

A clear egg doesn't automatically prove infertility. A late chick doesn't automatically prove your temperature was low. One dead-in-shell chick doesn't automatically mean your humidity was wrong.

Look at the whole hatch. Look for patterns. Change the things the evidence actually gives you a reason to change. And don't let one crappy hatch convince you that you're terrible at this.

We've had fantastic hatches. We've had disappointing hatches. We've had hatches that made us stare into the incubator and question every decision that led us to owning chickens in the first place.

That's hatching.

You learn, adjust, set another batch...

And start staring through the incubator window all over again.

 

🐣

Twenty-one damn days.
One chick and seventeen duds.
Cool. Cool cool cool.