Bluebirds in the Garden

by Jennifer Kistler

Bluebirds are a welcome sight in gardens and open landscapes and are one of the most beloved songbirds in North America. Three species of bluebirds live in North America: Eastern, Western, and Mountain Bluebirds. The Eastern Bluebird is most common in this region. Male bluebirds are vivid blue with a warm, rusty-orange breast. Females are softer in color with gray-blue tones. The blue color of their feathers is created by the structure of the feathers reflecting light, rather than by blue pigment.

Ten nesting boxes are placed about The Learning Fields, always ready to welcome bluebird families. Prior to the nesting season, four boxes were replaced and three others received new roofs to ensure safe and suitable nesting sites. Each box is clearly labeled with a number for easy identification and ongoing monitoring.

Throughout the nesting season, Master Gardener Jennifer Kistler tracks activity in every box, recording the species using the nest, the number of eggs and the dates they were laid, the number of nestlings, how many young successfully fledged, adults observed at the site, and any signs of damage or predator interference. This careful record-keeping helps us better understand nesting success and provides valuable data to support healthy bluebird populations.

Bluebirds typically begin looking for nesting areas in late February, with scouting intensifying as warmer weather approaches. Male bluebirds are often seen singing from high branches, defending territories, and bringing nesting materials to potential cavities to attract females. Some pairs may start building nests as early as mid-March, with egg-laying occurring in late March or early April. Bluebirds may continue to search for and use new nesting sites for second or third broods through July or even August. These beautiful insect-eating birds also contribute to natural pest control, helping maintain a healthy garden ecosystem while adding color and activity throughout the gardens.

Bluebirds built nests in three boxes at The Learning Fields early in the first nesting season of 2026. One box was abandoned before any eggs were laid and the other two boxes housed five eggs each.  The nests were monitored 1-2 times weekly throughout the nesting season. Interestingly, the adult bluebirds at each nest box displayed very different behaviors during monitoring visits.

The parents at one box were rarely seen nearby, while the adults at the other box were extremely alert and protective, often vocalizing loudly and watching from nearby trees or utility wires overhead. As I approached that nest box, the female would frequently dive-bomb me in defense of her nest, so I always wore a hat and gathered information as quickly and calmly as possible to minimize disturbance.

The female bluebird incubates the eggs for approximately 12-14 days after the last egg is laid. Hatching typically occurs over a 24-48 hour period, with all eggs usually hatching within a half hour to one day of each other. At The Learning Fields, five eggs hatched in one nest box and three eggs hatched in the other.

The young usually fledge, or leave the nest, in 17–18 days, although they may leave as early as 12 days. To avoid premature fledging, it is recommended not to open the nest box when the nestlings are about 12 days old. I am happy to report that all eight nestlings successfully fledged.

Once bluebirds leave the nest, they do not return to it. For the first 7-10 days after fledging, the young typically remain hidden nearby, calling to their parents and begging for food. By about 28 days old, they can fly well, and by 3-4 weeks after fledging, they are able to feed themselves after learning important foraging behaviors from their parents.

Bluebirds typically have 2-3 broods (or clutches) per year, depending on location, food supply, and weather. Just as the first young bluebirds became independent, the next chapter of the nesting season was already underway. Three nest boxes at The Learning Fields soon held new nests and a second round of eggs, offering another opportunity to observe these remarkable birds up close. Interestingly, two of the second broods were laid in the same nest boxes used earlier in the season.

While the first nesting cycle was remarkably successful, the second broods reminded us that nature doesn’t’ always follow the same path. Each nest told a different story, from loss to survival to complete success, and together they offered valuable insights into the challenges and triumphs of raising young bluebirds.

In one nest, four eggs were laid, but only one nestling successfully hatched and fledged. In another, four eggs hatched, but sadly all four nestlings died within a day of hatching, making it necessary to remove the nest. The third nest had a much happier outcome, with five eggs laid and all five hatching and successfully fledging. 

Bluebird nesting season spans from March through August, so there is still time to spot more bluebird activity. Keep an eye on the nest boxes (but please don’t open them), nearby fence lines, and garden pathways, you may catch a glimpse of bright blue feathers, hear the soft chatter of hungry fledglings, or watch devoted parents busily gathering insects for their young.

Every visit to The Learning Fields offers the chance to witness another small chapter in the story of a bluebird family.