How to hatch chicken eggs without guessing each step.
Chicken eggs usually hatch in about 21 days. The work is mostly steady temperature, sensible humidity, regular turning, useful candling, and a calm lockdown period.
Quick Reference
The 21-Day Journey
Four phases from set day to hatch.
Most questions make more sense when tied to where the eggs are in the hatch.
Setup & Preparation
Test the incubator before eggs go in. Use a reliable thermometer and hygrometer, place the incubator where room temperature stays steady, and avoid cracked, dirty, or badly shaped eggs.
- Run incubator empty for 24 hours to verify stable temperature
- Calibrate thermometer and hygrometer against a known reference
- Choose a location away from windows, drafts, and direct sunlight
- Select clean, well-shaped eggs from healthy, well-fed hens
Early Development
The embryo forms the circulatory system, brain, and heart. Visible veining often appears by day 5-7 when candled.
- Set eggs with the pointed end down or slightly angled
- Turn eggs at least 3 times daily (odd number preferred)
- Aim for about 99.5 F in forced air, or around 101.5 F measured near the egg top in still air
- First candle around Day 7 - look for veins radiating from a dark center
Growth & Development
The embryo grows rapidly. Feathers develop, the chick moves inside the egg, and the air cell grows as moisture is lost through the shell.
- Continue turning - regular movement helps reduce sticking risk
- Second candle around Day 14 - the embryo should take up more of the egg
- Watch the air cell size - by lockdown it should be noticeably larger than it was on Day 7
- Remove any eggs that are clear (infertile) or show blood rings (early death)
Lockdown & Hatch
The chick positions for pipping. Lockdown usually needs higher humidity so the membrane does not dry too quickly.
- Day 18: Stop turning eggs and lay them on their side.
- Move toward the maker-recommended lockdown humidity range, commonly around 65-75% for chicken eggs
- Limit lid openings unless there is a clear reason to intervene
- Expect pipping around Day 20–21. Leave chicks to dry before moving.
Species Comparison
| Species | Incubation | Temperature | Humidity | Lockdown Day | Lockdown Humidity |
|---|---|---|---|---|---|
| Chicken | 21 days | 99.5 F | 40-50% | Day 18 | 65-75% |
| Duck | 28 days | 99.5 F | 50-55% | Day 25 | 65-70% |
| Quail (Coturnix) | 18 days | 99.5 F | 45-50% | Day 15 | 65-70% |
| Turkey | 28 days | 99.5 F | 50-55% | Day 25 | 65-70% |
| Goose | 28-35 days | 99.5 F | 50-55% | Day 27 | 65-75% |
Common Mistakes
Running the incubator empty for 24 hours first prevents temperature and humidity surprises on Day 1.
Small fluctuations are normal. Focus on the average pattern, not minute-by-minute readings.
Opening the incubator after Day 18 can drop humidity fast. Keep checks brief and intentional.
Many chicks rest for 12-24 hours from pip to zip. Intervening too soon can cause bleeding.
Ready to start?
Use the Hatch Calculator to set your dates and get a full milestone timeline for any species.