The incubation period for a fertilized chicken egg takes 21 days. In some cases, chicken eggs may hatch at 19 or 20 days. But three weeks is a pretty reliable timeline.
If you are determined to hatch eggs au naturel, you must provide hens with a nest or box filled with straw, wood shavings, or other nesting material. And, of course, you will need to provide the fertilized eggs if your barnyard does not contain a rooster.
First, warm a bowl of water on the stove or in the microwave. Then, use a digital thermometer to check that the temperature rests at about 100 F.
– Humidity is too high – Humidity is too low – Temperature is too high – Temperature is too low – Eggs are too old – Eggs were handled roughly – Eggs were not fertilized – Eggs were not turned properly