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Species · Iowa · BBS 2026 Release · 1966–2025

Baltimore Oriole Population Trend in Iowa

All statesForest birds

Baltimore Oriole in Iowa has edged down: down 25% on the route-weighted index since 1969.

-25%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 →
39Routes 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 Baltimore Oriole 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 →

No notable trend signals for Baltimore Oriole in Iowa. See the full index history below.

Baltimore Oriole Population Forecast in Iowa

If the recent trend holds, Baltimore Oriole in Iowa is projected to rise about 24% by 2030 — from 3.6 in 2025 to a central estimate of 4.5 (95% range 2.6–6.4). A 5-year backtest shows a typical error of ±25%, with 100% of held-out values landing inside the 95% band.

+24%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 →
4.5Projected 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 →
2.6–6.495% 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 →
±25%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, Baltimore Oriole in Iowa is projected to rise about 24% by 2030 — from 3.6 in 2025 to a central estimate of 4.5 (95% range 2.6–6.4). A 5-year backtest shows a typical error of ±25%, 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 →
20264.52.66.4
20274.52.66.4
20284.52.66.4
20294.52.66.4
20304.52.66.4

Baltimore Oriole Survey Routes in Iowa

Routes recording Baltimore Oriole 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 Hamill1420251967
College Spgs1320041967
Red Rock1020251968
Alice1019991967
Zearing1019951967
Exline920251974
Washington920251967
Clare720191973
Sioux City720251968
Gaza720251969
Panther620251967
Brooklyn520221967
Bryant420251967
Cedar Valley419971967
Wales420251967
Maquoketa420251967
Hudson420251967
Mccallsburg420251996
Prairieburg320251967
Pierson320251968
Titonka320251968
Melrose220251974
West Liberty220251968
Desmoines219791968
Dinsdale220251969

Baltimore Oriole Population Trend in Other States

alabamaarkansascaliforniacoloradoconnecticutdelawaregeorgiaillinoisindianakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawest-virginiawisconsinwyoming

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