Are There Eastern Bluebirds in Colorado?
Yes, Eastern Bluebirds are found in eastern Colorado, primarily in the grasslands and open areas of the Great Plains east of the Rocky Mountains. They are absent or extremely rare in the mountains and western portions of the state. Populations in Colorado are most active during breeding season from spring through summer.
By Tim, founder of Easy Street Markets. I maintain the wildlife database and verify every animal and source myself. Updated July 20, 2026.
Eastern Bluebird · Archer Silverman CC BY
- 1
- species recorded
- 7,086
- GBIF records
- 6
- birding hotspots
- January, April, December
- peak months
Yes, eastern bluebirds are in Colorado. Next you'll want:
Real sighting data, source iNaturalist
134 verified observations on iNaturalist of eastern bluebird have been recorded in Colorado, most often in January, April, December.
When eastern bluebird are recorded in Colorado
Yes, Eastern Bluebirds are found in eastern Colorado, primarily in the grasslands and open areas of the Great Plains east of the Rocky Mountains. They are absent or extremely rare in the mountains and western portions of the state. Populations in Colorado are most active during breeding season from spring through summer.
Geographic Distribution in Colorado
Eastern Bluebirds are found exclusively in the eastern plains of Colorado, in the short-grass prairie and semi-arid grasslands east of the Rocky Mountain front. The greatest concentrations occur in the northeastern corner of the state around Weld and Logan counties, extending south through Morgan and El Paso counties. The South Platte River valley provides suitable riparian habitat with scattered trees. The Arkansas River valley in southeastern Colorado occasionally hosts populations. The eastern reaches of the state near the Kansas and Nebraska borders offer the best habitat and highest densities. The extensive grasslands of the Colorado plains provide the open country the species requires. Western Colorado, the mountains, and the San Juan Basin lack suitable habitat and rarely host Eastern Bluebirds. The species is virtually absent from Denver and surrounding urban areas west of the foothills.Learn about Colorado's eastern wildlife.
Seasonal Timing and Presence
Eastern Bluebirds in Colorado are primarily summer residents and migrants present from April through September. Peak breeding season occurs from May through July when males establish territories and pairs raise young. Spring migration in March and April brings increasing numbers northward from winter grounds. Fall migration in August and September sees birds moving southward and eastward toward winter habitat in the southern Great Plains and Mexico. Most Colorado bluebirds depart by late September, with very few remaining through winter. The birds are most active during early morning hours and again in late afternoon when insect availability peaks. Day roosting occurs on perches offering clear views of grassland below.Check Colorado's seasonal bird activity.
Identification Features
Male Eastern Bluebirds in Colorado are unmistakable with bright azure blue plumage on crown, back, wings, and tail, contrasted with a rusty-orange breast and white belly. Females are duller with grayish-blue upper parts, muted orange-buff breasts, and blue in wings and tail. Both sexes measure approximately six to seven inches in length. The distinctive combination of bright blue and orange-red chest distinguishes them from all other Colorado birds. Males often droop their wings when perched, showcasing the vivid blue. Posture is upright and alert. Calls include a soft musical warble and short chatter notes. In flight, the bird is graceful and buoyant. The bright coloring stands out against Colorado's grassland and sky backgrounds, making identification straightforward.
Where to Find Eastern Bluebirds in Colorado
Look for Eastern Bluebirds in open grasslands with scattered fence posts, dead trees, or utility wires for perching and hunting. The Pawnee National Grassland in Weld County provides excellent viewing opportunities. Fence rows and grazing areas throughout northeastern Colorado regularly host birds during breeding season. The area near Fort Morgan and east through the Eastern Plains offers reliable sightings. Riparian cottonwood galleries along the South Platte and Arkansas Rivers attract birds where trees provide nesting cavities and hunting perches. Many ranches and agricultural areas throughout eastern Colorado support populations. State Wildlife Areas in the northeast region offer access to productive habitat. Early morning visits to appropriate grassland habitat provide the best sighting opportunities.Explore Colorado's wildlife areas.
Behavior and Diet
Eastern Bluebirds are insectivores hunting from elevated perches by scanning the ground and dropping to catch grasshoppers, crickets, spiders, and beetles. This sit-and-wait hunting style is perfectly adapted to Colorado's open plains. They are highly territorial during breeding season, with males aggressively defending nesting areas against intruders. Both males and females participate in nest construction and chick-rearing. The species often raises two broods per season. They readily use natural tree cavities and artificial nest boxes. Pairs often return to the same nesting territory year after year if conditions remain favorable. Winter diet would include small seeds and fruits, but Colorado birds generally depart before winter scarcity becomes critical. Early morning foraging sessions capture peak insect activity.
Protection and Coexistence
Eastern Bluebirds are protected under the Migratory Bird Treaty Act in the United States, making it illegal to harm, capture, or kill them. Colorado populations are stable and healthy with no specific conservation concerns. The species poses no threat to people and naturally avoids conflict. Many conservation organizations throughout eastern Colorado maintain bluebird nest box programs providing safe breeding habitat where natural cavities are limited. These programs monitor breeding success and population health. Pesticide use can reduce insect availability, so avoiding chemicals helps bluebirds. Natural predators include hawks and snakes, but populations remain resilient. Supporting habitat protection and nest box programs helps ensure bluebirds continue to thrive.More about protecting Colorado's wildlife.
Similar-Looking Species in Colorado
The Mountain Bluebird, a western species, might be confused with the Eastern Bluebird. Mountain Bluebirds are paler blue and show less distinct orange coloring on the breast, and they prefer higher elevations and mountains. The Western Bluebird, found in parts of western Colorado, shows darker orange coloring more restricted to the breast and greater orange on the back. The Indigo Bunting, a small finch with blue plumage, lacks the distinctive orange-red breast and has different body proportions. Other Colorado birds lack the combination of bright blue and orange-red breast that characterizes the Eastern Bluebird, making identification straightforward when one is encountered.
Frequently Asked Questions
Q: Where in Colorado should I look for Eastern Bluebirds? A: The eastern plains, especially northeastern Colorado in grasslands with fence posts and scattered trees, offer the best chances for sightings. Q: When do Eastern Bluebirds breed in Colorado? A: They breed from May through July, with peak activity in June when most pairs are feeding young. Q: Do Eastern Bluebirds stay in Colorado during winter? A: No, most depart by late September, migrating southward to warmer winter habitat, making them a summer resident. Q: How can I help Eastern Bluebird populations in Colorado? A: Install nest boxes in suitable grassland habitat, avoid pesticides, and report sightings toColorado's wildlife database.
Plan your trip
Best time to see eastern bluebird in Colorado: January, April, December
See the month-by-month sighting calendar.
Plan your eastern bluebird sighting in Colorado
7,086 verified eastern bluebird records have been logged in Colorado, most recently in 2026. See the GBIF records.
Where to look in Colorado
- Bent's Old Fort National Historic Site · Wildlife Watching, Birdwatching · Find hotels
- Black Canyon Of The Gunnison National Park · Wildlife Watching, Birdwatching · Find hotels
- Colorado National Monument · Wildlife Watching · Find hotels
- Curecanti National Recreation Area · Wildlife Watching, Birdwatching · Find hotels
- Dinosaur National Monument · Wildlife Watching, Birdwatching · Find hotels
- Great Sand Dunes National Park & Preserve · Wildlife Watching, Birdwatching · Find hotels
- Pueblo Reservoir · 373 species recorded
- Barr Lake SP · 358 species recorded
- John Martin Reservoir · 352 species recorded
- Chatfield SP (Douglas Co.) · 349 species recorded
- Cherry Creek SP · 348 species recorded
- Chatfield SP (Jefferson Co.) · 336 species recorded
Birding hotspots via eBird (Cornell Lab).
Recent eastern bluebird sightings
- Windsor co kestrel Dr · 2026-07-19 09:25 · 2 seen
- home, east Table Mountain, Bldr Hls subdiv., 2mi. radius · 2026-07-18 06:00 · 2 seen
- Florence River Park · 2026-07-16 09:14 · 1 seen
- Pawnee NG Bird Tour--Stops 1-4 and Murphy's Pasture · 2026-07-14 12:42 · 2 seen
- Fowler Trail · 2026-07-12 05:42 · 1 seen
More wildlife in Colorado