Bluebirds Everywhere! Discover Denver’s Colorful Spring Visitors

As winter starts to loosen its grip, flashes of bright blue dart across the Front Range. The bluebirds are back! We’re super fortunate to be able to see all three North American species here—Mountain (right), Western (bottom left), and the least common Eastern Bluebird (top left). Telling the males apart isn’t too difficult once you get the hang of it. Female birds are “very demure, very mindful” and sport more subtle plumage characteristics. But bluebirds often hang out in mixed flocks giving birders opportunities to practice their ID skills!! Although all three species are found year-round in Colorado, our more common species ramp up their presence at the beginning of March..

Mountain Bluebirds: A Spring Classic

Mountain Bluebirds are the most common bluebirds you’ll spot in the Front Range. These birds are perfectly adapted to the open grasslands and foothills found in the area.

The males are hard to miss. Sky-blue from head to tail, they look like pieces of the sky have come to life, adding a jolt of color to the still-muted landscape.

Why March? As the days begin to warm (or at least aren’t as frigid), insects start to stir, providing the Mountain Bluebirds with the protein and fat-rich foods they need for migration and nesting. Some of the birds that we see here during this time could migrate as far north as Alaska!

Where to spot them: Mountain Bluebirds can be seen in open habitats with fences, shrubs, or other prominent perches to hunt from.

Western Bluebirds: The Woodland Specialist

Western Bluebirds increase their numbers in the Front Range in early spring too, though they’re not as numerous as their Mountain cousins east of the Rockies. They tend to stick to areas with more trees like mature cottonwood groves, parks, and older suburban neighborhoods.

What to look for: If you see a small bird with a blue throat and belly with a rusty orange chest, you can be confident that you are watching a male Western Bluebird.

Eastern Bluebirds: The Outlier

It might be surprising to learn that Eastern Bluebirds are even in Colorado at all. But this species can actually be found any time of year along the Front Range. In fact they are more common during the winter months. March is when most of the Eastern Bluebirds head to their breeding grounds in—you guessed it—eastern North America.

A special treat: If you spot a male with a deep orange breast that creeps up his throat and a vivid royal blue back, congratulations! You’ve found Colorado’s most elusive bluebird.

Where they wander: Open grassy areas with scattered trees, often near water. If you’re eager to spot one, check eBird species maps for local sightings.

They’re Similar—But Not Quite the Same

It’s easy to lump all bluebirds together. After all, they all:

• Share brilliant blue plumage 
• Nest in tree cavities and will happily use nest boxes
• Flock together during winter and migration

But telling them apart can be tricky. Just like distinguishing juvenile Bald Eagles from Golden Eagles at a distance, bluebird ID can challenge even experienced birders. But even if we aren’t able to tell whether they’re a Mountain, Western, or Eastern Bluebird, spotting them will always lift your spirits and have you looking for more!

Why Bluebirds Matter

Bluebirds aren’t just beautiful—they play a vital role in our ecosystems. They help control insect populations and spread seeds from the fruits they eat. Their presence signals healthy, balanced habitats full of food and safe nesting spots. (Nerdy facts: bluebirds are thrushes, in the taxonomic family Turdidae, like the American Robin and Townsend’s Solitaire. The blackbird made famous in The Beatles song is also a thrush, by the way!)

Want to help them thrive?

• Put up a nest box. Bluebirds are cavity nesters and will readily use well-placed boxes, especially where natural tree cavities are scarce.
• Go pesticide-free. A wildlife-friendly yard ensures bluebirds have plenty of insects to eat when they return.

Come Spot Bluebirds with Me!

Curious to see where bluebirds hang out? Join me for a guided walk and we’ll explore prime bluebird habitats together. I’ll share more tips on how to tell these species apart..

Let’s welcome these blue beauties back in person and see if we can find all three species! That sounds like an adventure!

Book your Rocky Mountain Arsenal Bird Tour here or reply to this email to discuss a custom tour!