BirdAnalyst
Species · Illinois · BBS 2026 Release · 1966–2025

Tufted Titmouse Population Trend in Illinois

All statesForest birds

Tufted Titmouse in Illinois has surged: up 156% on the route-weighted index since 1968.

+156%Since 1968TrendPercent 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 →
100Routes 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 →
59YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

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

long arc increasecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Tufted Titmouse has surged in Illinois: up 156% on the route-weighted index since 1968.

Tufted Titmouse Population Forecast in Illinois

If the recent trend holds, Tufted Titmouse in Illinois is projected to stay roughly flat through 2030, near 7.3 (95% range 5.1–9.5). A 5-year backtest shows a typical error of ±22.3%, with 80% of held-out values landing inside the 95% band.

-8%Change by 2030TrendPercent 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 →
7.3Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
5.1–9.595% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±22.3%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, Tufted Titmouse in Illinois is projected to stay roughly flat through 2030, near 7.3 (95% range 5.1–9.5). A 5-year backtest shows a typical error of ±22.3%, with 80% of held-out values landing inside the 95% band.19662030
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
20267.04.89.2
20277.14.99.3
20287.14.99.4
20297.25.09.4
20307.35.19.5

Tufted Titmouse Survey Routes in Illinois

Routes recording Tufted Titmouse in Illinois.
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 →
Mt Vernon4820251971
Bremen4320251969
Belknap4320251970
Pulaski4020251970
Delwood4020251970
Beaverdam Lk3320231970
Royalton3320252001
Bradbury3220251971
York3120251993
Athens3020251995
Cave In Rock2420241993
Sandusky2120231993
Belleview2020251966
Mascoutah Lk1820251967
Birds1520241976
Kell1520252001
Eubanks1420252001
Dudleyville1420252001
Brnt Prairie1320251976
St Morgan1220221967
Robinson1120231970
Brownville1120251993
Deer Creek920241966
Yale920251993
Columbia820251967

Tufted Titmouse Population Trend in Other States

alabamaarkansasconnecticutdelawarefloridageorgiaindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourinebraskanew-hampshirenew-jerseynew-yorknorth-carolinaohiooklahomapennsylvaniarhode-islandsouth-carolinatennesseetexasvermontvirginiawest-virginiawisconsin

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.