Coturnix Quail Incubation Day by Day: A 17-Day Guide

Coturnix quail hatch in 17 days — barely more than two weeks from setting the eggs to a brooder full of chicks. That short window is what makes them so satisfying to hatch, and also what makes mistakes expensive: there is no slack in the schedule. Get the first fourteen days right and the last three mostly take care of themselves.

Here is the whole run, day by day, with the numbers that matter at each stage.

The numbers, up front

• Incubation length: 17 days (some hatches start on day 16 and finish on day 18 — that is normal).
• Temperature: 99.5°F in a forced-air incubator, or 100.5°F measured at egg height in a still-air incubator.
• Humidity, days 1–14: around 45% relative humidity.
• Humidity, day 14 onward (lockdown): 65–75%.
• Turning: 3–5 times a day, an odd number, until day 14. Then stop completely.
• Candling: day 5 and day 10.
• A good hatch: 70–85% of the eggs you set; 80–90% of the eggs that were actually fertile.

Before day 1: choosing and storing the eggs

Half of a bad hatch is decided before the incubator is even plugged in. Set eggs that are clean but unwashed, normal in shape, and free of hairline cracks — hold each one up to a flashlight if you are unsure. Skip the very smallest and the odd giants (usually double-yolkers, which almost never hatch).

Store collected eggs pointy-end down at around 55–65°F and tilt the carton once a day. Hatchability is excellent for the first 7 days of storage, drops noticeably after 10, and falls off a cliff past 14. Shipped eggs are a different animal: let them rest upright, pointy-end down, for 8–12 hours before setting so the air cells can settle.

Run the incubator empty for at least 12 hours before you set. You are not testing whether it turns on — you are testing whether it holds. And verify the temperature with your own thermometer at egg level, not the display. Built-in sensors are the single most common cause of a hatch that fails for no visible reason.

Days 1–3: the setup you cannot fix later

Set the eggs, close the lid, and let the temperature recover — a cold set will dip the incubator for an hour or two, which is fine. From here, your job is stability. A steady 99°F beats an average of 99.5°F that swings between 97 and 102.

Turning starts now: 3–5 times daily, always an odd number so the eggs do not spend every night resting on the same side. An automatic turner handles this; if you turn by hand, mark one side with an X and the other with an O so you can see at a glance what has been done.

Set your target dates on day 1, while you are thinking about it. The free hatch-date calculator takes your set date and gives you the exact calendar dates for both candlings, lockdown, and hatch day — for Coturnix, Bobwhite, Button quail, or chickens. Write those four dates on a piece of tape on the incubator lid.

Days 4–7: the first candling (day 5)

By day 5 a fertile Coturnix egg shows a clear spider-web of blood vessels radiating from a dark spot. Candle in a dark room with a bright, focused light. Dark or heavily speckled eggs are genuinely hard to read — if you cannot tell, leave the egg in and check again on day 10. Nothing is lost by waiting.

What you are looking for:

• Veining with a visible embryo — developing, leave it in.
• Completely clear — infertile, or it never started. Pull it.
• A blood ring (a distinct red circle) — development started and stopped. Pull it; these are the ones that go rotten.

The clear-versus-blood-ring distinction is worth learning, because it tells you where your problem is. A pile of clears is a breeding problem — male-to-female ratio, an old or overworked cock bird, or birds too young. A pile of blood rings is an incubation problem — usually a temperature spike or eggs stored too long.

Days 8–13: the quiet stretch (candle again on day 10)

These days are the easiest and the most tempting to fiddle with. Do not. Top up water when the humidity dips, keep the lid closed otherwise, and let it run.

On day 10 the embryo should fill most of the egg, leaving a dark mass with a defined air cell at the fat end. Warm eggs often move visibly when candled — a reassuring thing to see. Pull anything that has stalled.

This is also the point to check your air cells if you are chasing a persistent problem. By day 10 the air cell should occupy roughly a fifth of the egg. Too small means humidity has been too high and the chicks will drown at hatch; too large means the eggs are drying out and the chicks will be shrink-wrapped in a leathery membrane. Adjust humidity by a few points in the days you have left, not by twenty.

Day 14: lockdown

Day 14 is the pivot. Three things happen and then you leave it alone:

• Stop turning and remove the turner. The chicks need to orient themselves toward the air cell.
• Raise humidity to 65–75%. Add water to the reservoirs or a wet sponge; more surface area, not deeper water.
• Lay out a non-slip floor — shelf liner, paper towel, or hatching mat. Bare plastic causes spraddle leg in chicks that hatch onto it.

Then close the lid and keep it closed. Every time you open the incubator during hatch, humidity crashes and the membrane around a half-hatched chick dries into shrink-wrap. This is the number one killer of chicks that were otherwise going to make it.

Days 15–17: hatch

You will usually hear peeping from inside the eggs before you see anything. Then comes the pip — a small break in the shell — followed by zipping, where the chick cuts a ring around the egg and pushes out. From pip to fully out typically takes 6–12 hours, and a chick can rest for hours mid-zip. That pause is normal. It is not distress.

Leave newly hatched chicks in the incubator until they are dry and fluffy, which takes 6–12 hours. They absorb the yolk sac just before hatching, so they need no food or water for the first 24 hours — resist the urge to open the lid and rescue them while siblings are still hatching.

Do not assist a hatch on day 16 or early day 17 simply because it is slow. Most assisted chicks that die would have hatched on their own; the ones that genuinely need help are usually stuck because humidity was wrong, and by then the damage is done. If you must intervene, wait until at least 24 hours after the pip and open only a small window near the beak.

Day 17 onward: into the brooder

Brooder temperature starts at 95–98°F under the heat source and drops about 5°F a week until they are feathered at 4–6 weeks. Coturnix chicks are tiny — smaller than a large marble — and drown in ordinary waterers with alarming ease. Use marbles or pebbles in the water tray for the first week.

Start them on a game-bird starter crumble (chick starter is milled too coarse; run it through a blender if that is all you have). Watch for spraddle leg and curled toes in the first 48 hours — both are fixable within a day or two of hatching and permanent if you wait a week.

When a hatch goes wrong, the records tell you why

A single bad hatch is bad luck. Three bad hatches is a pattern, and the only way to see a pattern is to have written down the last three. For every batch, record the set date, how many eggs went in, how many were fertile at day 5, and how many chicks came out. Fertility rate and hatch rate are different numbers with different fixes, and if you only track "how many chicks did I get," you cannot tell them apart.

Quail Keeper Max logs incubation batches and hatch rates alongside the breeding pens that produced the eggs — so when fertility slips, you can see which pen it came from and which cock bird is due for replacement. Captain Coturnix, the built-in advisor, reads your batch history and flags the trend before it costs you a whole season.

Setting eggs this week? Start with the hatch-date calculator — it is free and takes no account — then try Quail Keeper Max free for 14 days to keep the batch record that turns a lucky hatch into a repeatable one.