BirdAnalyst
Species · Colorado · BBS 2025 Release · 1966–2024

Eastern Bluebird Population Trend in Colorado

All statesForest birds

Eastern Bluebird in Colorado has fallen sharply: down 74% on the route-weighted index since 1993.

-74%Since 1993TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
12Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
12YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Eastern Bluebird Trends in ColoradoNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

No notable trend signals for Eastern Bluebird in Colorado. See the full index history below.

Eastern Bluebird Survey Routes in Colorado

Routes recording Eastern Bluebird in Colorado.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →
Fleming420031970
Wildhorse L220062006
Harmony219961996
Gardner220012001
Doyle Bridge 2120212017
Mesaverde Np120052005
Grover120172017
Abarr120072007
Boyero119791979
Doyle Bridge119971997
Haswell119931993
Ellicott120062006

Eastern Bluebird Population Trend in Other States

alabamaarizonaarkansasconnecticutdelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawest-virginiawisconsinwyoming

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.