Day 19 and Quail Eggs Still Not Hatched
Coturnix are due on day 17, so day 19 is two days over — late, but still one of the most common “late hatch” days there is. An incubator running slightly cool stretches a 17-day hatch to 19 days without killing a single egg. Day-19 hatches happen constantly; they are just underreported because nobody posts about the panic that resolved itself overnight.
Tonight: lid stays closed, temperature stays where it is. Listen for peeping, look for rocking, and give it through the end of day 20. That is when this stops being a waiting page and becomes a candling decision.
First: make absolutely sure it is day 19
This sounds insulting until you learn how often it is the answer. The set day counts as day 0 — day 1 is your first full day of incubation. Keepers who count the set day as day 1 arrive at “day 19” when the eggs are genuinely on day 18, and day 18 is the tail of a normal Coturnix window. Before you worry any further, take your written set date — not your remembered one — and run it through the hatch date calculator. If the calculator says you are actually on day 18, read the day-18 page instead and relax a little.
What day 19 means for each species
| Species | Expected hatch | Day 19 is… |
|---|---|---|
| Coturnix | Day 17 | Two days late. Common with a cool incubator. Wait through day 20. |
| Button | Day 16 | Three days late. The odds have dropped — candle now rather than waiting. |
| Chicken | Day 21 | Two days early. Nothing should be hatching. Close the lid. |
| Bobwhite | Day 23 | Four days early. You are still in lockdown territory. Not late. |
The rest of this page assumes Coturnix on day 19, because that is the search that brings almost everyone here.
Why a hatch runs two days late
Incubation is a heat budget, and a late hatch means the budget ran short. The usual suspects, in order of how often they turn out to be the answer:
- The incubator ran cool and the thermometer lied about it. Less than one degree of deficit, compounded over seventeen days, is enough to push a hatch two days. The display on the incubator itself is the least trustworthy number in the room — the classic forum thread ends with two thermometers disagreeing and a full clutch hatching on day 19.
- The eggs were stored a while before setting. Eggs held longer than about a week before going in develop slower and hatch later — roughly an extra day for eggs stored toward the ten-day mark. If these were shipped eggs that sat in transit, this is probably your answer, and it stacks with a cool incubator.
- Still-air incubator measured in the wrong place. A still-air unit needs 100.5°F (38.1°C) at egg height. Run one at the forced-air setpoint of 99.5°F — or measure the warm air at the top of the dome instead of down at the eggs — and you have built a slow hatch on purpose without knowing it.
- Cold room, hard winter, frequent lid openings during incubation. Every temperature dip is a small withdrawal from the same budget.
Whatever the cause was, do not correct it today. Raising the temperature on day 19 cannot repay a seventeen-day deficit, and it actively endangers chicks that are already in hatching position. The fix happens after this hatch: verify your thermometer against a second calibrated one, at egg height, and write down what you find for the next batch.
The day-19 checklist
Everything useful you can do tonight happens without opening the lid:
- Listen with the room silent. Chicks pip internally into the air cell before breaking any shell, and they peep from inside. Peeping from an unpipped egg on day 19 means the hatch is coming — it can still be 12 to 24 hours from the first external pip.
- Watch for rocking. Give it a full quiet minute per look. An egg that has shifted position since your last check is an egg with a live, working chick in it.
- Check humidity through the window and top up the reservoir through the external fill port if your incubator has one. Lockdown humidity should be at 65–75%, and it matters more on a stretched hatch, not less — the membrane has had two extra days to dry.
- Log the time and what you observed. Every decision from here is driven by elapsed hours. “It was rocking at 9pm” written down beats “I think it moved earlier” remembered at 2am.
- If an egg has pipped and stalled — that is its own situation with its own thresholds, and it is covered properly in pipped but not hatching.
Day 20: the decision point
If day 20 ends with no pip, no peeping, and no movement, waiting longer stops being patience and starts being avoidance. Now candling is worth the lid-opening it costs, because you are no longer protecting a hatch — you are finding out whether there is one.
Candle every remaining egg. You will see one of three things:
- Movement, or a full dark mass with a clear air cell — a live chick, just slow. Lid down, humidity up, give it through day 21. Day-20 and day-21 hatches are rare but real, and they come from exactly this scenario.
- Clear eggs, or a faint ring of blood — never fertile, or development stopped early. Neither is rescued by more days in the incubator.
- Fully dark egg, no movement, no peeping, air cell not drawn down — the least certain read. Give these through day 21 before calling it; a resting chick is easy to mistake for a dead one through a shell.
When you do call it — day 21 with silence and stillness is a fair place to call it — open the unhatched eggs before you discard them. Nobody enjoys the eggtopsy, but it is the only step that converts a failed hatch into information: clear eggs point at the breeding pen, early quitters point at a temperature spike or rough storage, and fully formed unpipped chicks point at temperature, humidity, or both. The full walkthrough — reading each outcome and the ten changes that raise the next hatch — is in how to improve Coturnix hatch rates.
Before the next batch
A day-19 hatch — even one that ends well — is your incubator telling you something. Two thermometers, checked against each other at egg height, before the next set. Eggs set within a week of collection. And a written log of set date, temperatures, and hatch day, so that next time the question “is day 19 late for my setup?” has an answer instead of a guess.
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Common questions
When should I give up on quail eggs that haven't hatched?
Candle at the end of day 20 if there has been no pip, no peeping, and no movement. Anything alive gets through day 21; clear eggs and blood rings will not improve with more days. Day 21 with silence and stillness is a fair place to call the hatch.
Can quail eggs hatch on day 20 or 21?
Rarely, yes. Day-20 and day-21 Coturnix hatches come from incubators running distinctly cool or from eggs stored a long time before setting. They are the exception, which is why day 20 is the candling point rather than the give-up point.
Why are my quail hatches late every single batch?
A consistent two-day delay is a consistent temperature bias, and the usual culprit is the thermometer rather than the incubator. Verify it against a second calibrated thermometer at egg height, and check that a still-air unit is being run at 100.5°F rather than the forced-air setpoint of 99.5°F.
Do stored or shipped eggs hatch later?
Yes. Eggs held longer than about a week before setting develop more slowly and can hatch roughly a day late, and shipped eggs that spent days in transit often do the same. It stacks with a cool incubator, which is how a hatch ends up two days over.
Should I open the eggs that never hatched?
Yes, once you have called the hatch. Clear eggs point at fertility in the breeding pen, early-quit embryos point at a temperature spike or rough storage, and fully formed unpipped chicks point at temperature or humidity late in incubation. Each finding fixes a different thing in the next batch.
Is it OK to candle on day 19?
If you can hear peeping or see rocking, there is nothing candling can tell you that is worth the humidity you lose opening the lid. If the incubator has been completely silent and still, waiting one more day and candling everything at the end of day 20 answers the question properly in a single opening.
More hatch troubleshooting
A note from one keeper to another: this guide reflects established quail-keeping practice and first-response care, but it isn't veterinary medicine, and no article can examine your bird. When a symptom is severe, worsening, or just doesn't add up, a qualified avian or poultry veterinarian is the right call — and for emergencies, call one first. Your state's poultry diagnostic lab is also a keeper's best friend when losses need real answers.