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

Cerulean Warbler Population Trend in Connecticut

All statesForest birds

Cerulean Warbler in Connecticut has increased: up 43% on the route-weighted index since 1990.

+43%Since 1990TrendPercent 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 →
6Routes 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 →
15YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Cerulean Warbler Trends in ConnecticutNotable 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 Cerulean Warbler in Connecticut. See the full index history below.

Cerulean Warbler Survey Routes in Connecticut

Routes recording Cerulean Warbler in Connecticut.
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 →
Sherman320182001
Mystic119951989
Uncasville119981998
Woodstock119961989
Willimantic119991979
Mid Haddam120232023

Cerulean Warbler Population Trend in Other States

alabamaarkansasgeorgiaillinoisindianakentuckylouisianamarylandmassachusettsmichiganminnesotamississippimissourinew-hampshirenew-jerseynew-yorknorth-carolinaohiooklahomapennsylvaniatennesseevermontvirginiawest-virginiawisconsin

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