Lockdown Day 18: 7 Mistakes That Kill Hatches (and What to Do Instead)

You can do everything right for 18 days and still lose the hatch in the last 72 hours. I know, because my second hatch was a textbook case: a beautiful day-18 candle, then I got curious, then I got helpful, and then I had three stuck chicks and a hard lesson. Lockdown, days 18 to 21 for chickens, is when the chick positions itself, pips internally, and starts the exhausting work of getting out. Your job during these three days is mostly to leave them alone. Here are the seven ways people fail at that.

1. Opening the lid to "check on them." This is the number one killer. Every opening dumps humidity, and humidity is what keeps the inner membrane soft and flexible. When humidity crashes mid-hatch, the membrane dries onto the chick like shrink-wrap and it cannot turn to zip out of the shell. One peek can drop humidity 15% for half an hour. If your incubator does not have a viewing window, get one with a window next time. During lockdown, the lid stays shut.
2. Forgetting to raise the humidity. Days 1 to 18 want 50-55% relative humidity. Lockdown wants 65-70%. If you cruise into day 19 at 50%, the membranes dry out and pipping chicks stall. Fill every water channel, add a damp sponge for extra surface area, and confirm the rise before you close the lid for the last time. For dry climates, pre-fill generously; a shallow tray plus sponge holds the target far better than channels alone.
3. Raising humidity too high. The other extreme is real too. Pushing past 75% makes everything slick; chicks slip as they try to zip and exhaust themselves, sometimes dying in the shell. The target is 65-70%, not 85%. If humidity overshoots and nothing has pipped yet, you can crack the vent briefly to bring it down. Once pips appear, leave it alone.
4. Leaving the turner running. Day 18 is when turning stops, full stop. The chick is positioning its head under the right wing toward the air cell, and continued turning disrupts that. Take the eggs out of the turner, lay them on their sides (or in hatching position, large end slightly up), give them a little space between each other, and unplug the turner.
5. "Helping" a chick too early. From external pip to fully hatched can take 24 hours. That is normal. The chick is absorbing the yolk sac and the blood vessels in the membrane are retracting; pull shell away too early and you tear vessels that are still live, which can be fatal. The rule experienced hatchers repeat like a mantra: do not assist before 24 hours have passed since the external pip with zero progress, and even then only if you see no fresh blood. Most chicks that look stuck are just resting between efforts.
6. Moving chicks to the brooder too soon. A freshly hatched chick is wet and exhausted, and the incubator is the perfect warm, humid recovery room. Leave hatched chicks in the incubator until they are dry and fluffy, usually up to 24 hours. They are fine without food and water in that window; they are still running on the absorbed yolk. Moving a damp chick to a brooder risks chilling it.
7. Panicking on day 22. Day 21 is an average, not a deadline. Chicks routinely hatch on day 22 and even day 23, especially if temperatures ran a touch low during incubation. Give the stragglers until about two days past the expected date, candle the unhatched eggs to check for signs of life, and only then call it. I have had my best chick of a hatch arrive on day 22 while I was already mourning it.

The lockdown checklist

If you remember nothing else, remember this sequence on the evening of day 18: final candle, remove clears and quitters, take eggs out of the turner and lay them on their sides, fill all water channels plus a sponge, confirm 65-70% humidity, close the lid, and do not open it again until the hatch is over. Temperature stays at 99.5F. Your work is done. The chicks have the hard part now.

One more thing: the brooder should be ready

The classic lockdown-adjacent mistake is hatching chicks with nowhere warm to go. Set up the brooder before lockdown, not during it: 95F under the heat source for week one, dropping 5F per week, with chick starter and water (marbles in the water dish so nobody drowns) ready. A chick that hatches into a cold, unprepared brooder is a chick in trouble.

The bottom line

Lockdown rewards inaction. Raise the humidity, stop the turner, close the lid, and sit on your hands. The chicks know what they are doing; most failed hatches in the last three days are not chick failures, they are keeper interference. Be patient, and enjoy the best three days of the whole hobby.

New to incubating other species? Start with Duck Eggs vs Chicken Eggs in the Incubator to see how the calendar changes for waterfowl.