Bluebird Baby: Fledglings (Day 18)

Brian and I are officially empty nesters again! Our bluebird nestlings hatched on July 29, 2026, and left the nest on August 13 and 14, 2026—a mere 16 to 17 days. This is a little on the early side, as only 23% fledge on days 16 and 17. But our fledgling story hasn’t ended yet. They are now “teenagers,” still dependent on their parents for a time before they become full-fledged adults. Here is the rest of the story in a handy FAQ arrangement.

1. How do parents prepare the young to leave the nest?
   Around day 15, mom and dad start slowing down their food deliveries to encourage the nestlings to take that big step outside. Decreasing food may seem unkind, but it helps the youngsters drop a bit of extra weight for an easier first flight! While they are adjusting to the lighter menu, the parents hover just outside the cavity, calling out warmly to coax them onward and guide them out into the world.
   
   
2. What’s the last sign that they’re ready to fledge?
   You’ll know the big moment is very close when they start eagerly begging for food right from the nest-cavity entrance. Seeing all those little heads peeking out the hole at the world around them reminds me of kids packed into the back seat “discussing” who gets the window seat! It is the ultimate sign that they are starting to think seriously about leaving the nest.
   
   
3. Do they fledge on the same day?
   Usually, the entire brood likes to stick together and will fledge within a tight two-hour window. But sometimes one little one—often a late-hatching or slightly smaller chick—holds out until the next day.
   
   That script played out right in our box! I couldn’t always keep track of who was who amidst all the backseat-driver jostling, but sure enough, the smallest chick took its time and successfully fledged early the next morning.
   
   

4. What time of day do they fledge?
While I expected our nestlings to launch early in the morning, three of them waited until later in the day—
and I completely missed it! Even so, our crew still landed right within that expected window. Predation risk
drives the whole schedule, as youngsters need to head out early enough to find a safe perch before dark.
They usually make their move about six hours after sunrise when the weather cooperates.

5. How far do they fly?
That first flight usually covers anywhere from 10 to 55 yards. This maiden voyage is quite a spectacle,
happening in a straight line with nonstop wingbeats as they scramble for a safe perch. Some birds don’t
quite make it that far. If they miss a landing spot, they drift down to the ground where they are in danger
from predators. Because their initial flying skills are so rudimentary and they lack the strength to fly right
back up, they are physically unable to return to the nest box.

6. Where do fledglings go?
They head to nearby hidden spots and eventually into the higher branches of nearby trees!

For about the first week, they stay cleverly hidden away in separate locations while their parents keep right
on feeding them. They call out from these separate spots for food delivery. Eventually, as they grow more
confident, they make their way up to the higher branches of nearby trees, where the whole sibling crew
eventually huddles closely together on a single branch!

7. How can you locate the fledglings from your nest box?
If you want to track them down, start by listening for their characteristic calls. Watch for adult bluebirds
carrying food toward nearby trees and fence lines within a 10 to 55-yard radius. Scan the lower branches
and look for huddled silhouettes. They are very clever at hiding!

Even so, finding them can be tough! I’ve looked for the fledglings from our nest box on more than one
occasion. It’s been both disappointing and happy that I can never find them. I’m sad because I simply want
to see them again. It’s good news because I hope they are hidden enough that predators won’t find them.

9. How do parents support fledglings?
   Fledglings give a characteristic call upon leaving the nest, which the parents use to track them down and locate them. During the day, their parents know exactly where to find them to deliver meals. The parents do not sleep with their fledglings at night.
   
   As they gain independence over the next couple of weeks, the fledglings begin to feed themselves right alongside mom and dad. By following the adults around, they gradually take less and less food as they learn the ropes of foraging. Overall, young bluebirds stay closely supported by their parents for about three weeks post-fledging, with field studies showing that the adults officially stop feeding the chicks around day 40 after hatching.
   
   
10. How do fledglings develop and grow after leaving the nest?
    Even after leaving the nest, young bluebirds still have some growing up to do. When they first take off, their wings and tails are short, rounded, and still growing. Their feathers also feature unsheathed bases.
    
    As time goes on, those wing and tail feathers continue to stretch out. They grow to adult size in about 35 to 40 days.
    
    Within 28 days of fledging, the babies are fully able to find their own food. Even so, they may still continue to beg from time to time. During this same window, the juveniles stop getting fed by their parents altogether and officially become nutritionally independent.
    

Watching our little ones take that big leap into the world is always bittersweet. Seeing them navigate their new “teenager” phase makes every moment worthwhile. Whether you’re watching your own backyard nest box or simply cheering them on from afar, these resilient little bluebirds never cease to amaze us. Thanks for following along on our nesting journey!

Resources:

Sialis.org
Fledging and Fledglings

Avian Report
Fledging Bluebirds: A Few Things to Know