Bluebird eggs typically take about 12 to 14 days to hatch after incubation begins, with an average incubation period around 13 to 13.5 days. The female usually starts incubating the eggs on the day she lays the last egg of the clutch, so all eggs hatch around the same time
. The incubation period can vary somewhat depending on the region, with warmer southern areas tending to have slightly shorter incubation times and northern colder regions having longer periods, ranging roughly from 11 to 19 days
. In summary:
- Incubation period: about 12-14 days (average ~13.5 days)
- Incubation starts after the last egg is laid
- Eggs hatch roughly simultaneously after this period
This timing ensures the hatchlings emerge together, allowing the parents to care for them efficiently
