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

Northern House Wren Population Trend in Maine

All statesForest birds

Northern House Wren in Maine has increased: up 35% on the route-weighted index since 1968.

+35%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 →
51Routes 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 →
57YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Northern House Wren 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 →

No notable trend signals for Northern House Wren in Maine. See the full index history below.

Northern House Wren Population Forecast in Maine

If the recent trend holds, Northern House Wren in Maine is projected to fall about 61% by 2030 — from 3.2 in 2025 to a central estimate of 1.2 (95% range 0.00–2.7). A 5-year backtest shows a typical error of ±81.4%, with 0% of held-out values landing inside the 95% band.

-61%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 →
1.2Projected 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 →
0.00–2.795% 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 →
±81.4%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, Northern House Wren in Maine is projected to fall about 61% by 2030 — from 3.2 in 2025 to a central estimate of 1.2 (95% range 0.00–2.7). A 5-year backtest shows a typical error of ±81.4%, with 0% 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 →
20261.20.002.7
20271.20.002.7
20281.20.002.7
20291.20.002.7
20301.20.002.7

Northern House Wren Survey Routes in Maine

Routes recording Northern House Wren 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 →
Cornville1120252022
Turner 2920252011
Westbrook820241977
Cape Neddick720241972
Carrying Pl720251993
Greenwood520251976
Harmony520251989
Kittery Pt420251966
Newcastle420231977
Reeds420251992
Hartford420251975
Brownfield 2420252010
Turner320101972
Bowdoin Ctr320211980
Searsport320252022
Biddeford220191973
Bethel220211977
Manchester219941976
Warren219881987
Freedom220221976
Brooks220101996
Topsfield219961992
Grnd Lk Strm219931991
Rome220241999
Jefferson220071991

Northern House Wren Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradoconnecticutdelawaregeorgiaidahoillinoisindianaiowakansaskentuckylouisianamarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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