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Species · Iowa · BBS 2026 Release · 1966–2025

Tufted Titmouse Population Trend in Iowa

All statesForest birds

Tufted Titmouse in Iowa has fallen sharply: down 64% on the route-weighted index since 1969.

-64%Since 1969TrendPercent 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 →
29Routes 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 →
58YearsYears 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 IowaNotable 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 declinecomputed 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 fallen sharply in Iowa: down 64% on the route-weighted index since 1969.

Tufted Titmouse Population Forecast in Iowa

If the recent trend holds, Tufted Titmouse in Iowa is projected to fall about 39% by 2030 — from 0.32 in 2025 to a central estimate of 0.20 (95% range 0.00–0.65). A 5-year backtest shows a typical error of ±41%, with 100% of held-out values landing inside the 95% band.

-39%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 →
0.20Projected 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 →
0.00–0.6595% 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 →
±41%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 Iowa is projected to fall about 39% by 2030 — from 0.32 in 2025 to a central estimate of 0.20 (95% range 0.00–0.65). A 5-year backtest shows a typical error of ±41%, with 100% of held-out values landing inside the 95% band.19672030
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 →
20260.230.000.68
20270.220.000.67
20280.210.000.66
20290.200.000.66
20300.200.000.65

Tufted Titmouse Survey Routes in Iowa

Routes recording Tufted Titmouse in Iowa.
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 Hamill520251967
Cedar Valley519961967
Bedford220121968
Williamsburg219921967
Alice219991968
Prairieburg220001968
Exline120251974
Melrose120251975
College Spgs119761969
Bryant120251968
West Liberty120251971
Brooklyn120211968
Red Rock120231969
Desmoines119701968
Panther120021971
Washington120211967
Neola120021981
Wales120021967
Maquoketa120171970
Hudson119781976
Zearing119921968
Scranton120222022
Festina120251968
Davis Corner119681968
Titonka119801980

Tufted Titmouse Population Trend in Other States

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

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