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Species · Maine · BBS 2026 Release · 1966–2025

Baltimore Oriole Population Trend in Maine

All statesForest birds

Baltimore Oriole in Maine has fallen sharply: down 50% on the route-weighted index since 1968.

-50%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 →
55Routes 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 Baltimore Oriole Trends in MaineNotable 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 →

Baltimore Oriole has fallen sharply in Maine: down 50% on the route-weighted index since 1968.

Baltimore Oriole Population Forecast in Maine

If the recent trend holds, Baltimore Oriole in Maine is projected to fall about 47% by 2030 — from 0.50 in 2025 to a central estimate of 0.27 (95% range 0.00–1.7). A 5-year backtest shows a typical error of ±17.6%, with 100% of held-out values landing inside the 95% band.

-47%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 →
0.27Projected 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 →
0.00–1.795% 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 →
±17.6%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 Maine is projected to fall about 47% by 2030 — from 0.50 in 2025 to a central estimate of 0.27 (95% range 0.00–1.7). A 5-year backtest shows a typical error of ±17.6%, with 100% 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 →
20260.420.001.9
20270.380.001.8
20280.340.001.8
20290.300.001.8
20300.270.001.7

Baltimore Oriole Survey Routes in Maine

Routes recording Baltimore Oriole in Maine.
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 →
Manchester619951971
Benton519801971
Turner420101972
Forest Sta419791966
Otisfield Gr320151971
Hancock319951969
Ft Fairfield320041993
Cape Neddick220241972
Hartford220251975
Bowdoin Ctr220211971
Warren219901973
Harmony220251967
Seboomook Lk220051996
Horse Mtn219841983
St David220041982
Cornville220252019
Turner 2220252012
Westbrook120141977
Biddeford120161973
Kittery Pt120251966
Newcastle120241971
Bethel120181978
Greenwood120221966
Reeds120191992
South Arm120101983

Baltimore Oriole Population Trend in Other States

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

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