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How long does it take bluebird eggs to hatch?

Eggs can be laid as early as late March or as late as early July, depending upon the weather and latitude. Females may begin to lay eggs one or two days after the nest is completed, but some females wait a week or more. One egg is laid each day, in the morning. The average clutch has three to five eggs but as many as seven have been reported.

Females generally begin to incubate the day the last egg is laid. The incubation period is 12 to 14 days but can be longer in the case of extreme or prolonged cold weather.

The young leave the nest after 16 to 22 days, but they remain dependent upon their parents for food and protection for three to four weeks.