BirdAnalyst
Species · Maine · BBS 2025 Release · 1966–2024

Winter Wren Population Trend in Maine

All statesForest birds

Winter Wren in Maine has held roughly steady: up 8% on the route-weighted index since 1968.

+8%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 →
76Routes 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 Winter 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 Winter Wren in Maine. See the full index history below.

Winter Wren Population Forecast in Maine

If the recent trend holds, Winter Wren in Maine is projected to rise about 49% by 2029 — from 5.1 in 2024 to a central estimate of 7.6 (95% range 1.3–14). A 5-year backtest shows a typical error of ±78.3%, with 100% of held-out values landing inside the 95% band.

+49%Change by 2029TrendPercent 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 →
7.6Projected 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
1.3–1495% 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 →
±78.3%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, Winter Wren in Maine is projected to rise about 49% by 2029 — from 5.1 in 2024 to a central estimate of 7.6 (95% range 1.3–14). A 5-year backtest shows a typical error of ±78.3%, with 100% of held-out values landing inside the 95% band.19662029
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 →
20257.41.114
20267.41.114
20277.51.214
20287.61.214
20297.61.314

Winter Wren Survey Routes in Maine

Routes recording Winter 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 →
Pillsbury Pd6519681968
Telos3120061995
Wytopitlock2919981976
Seboomook Lk2520141972
Carrying Pl2420241979
Wilson Mills2320241983
Baker Lake2320091994
Nesowadnehun2220211990
Baxter2119881977
Heron Lake2120031983
Ludlow2019981968
Reeds1820241990
Yankeetuladi1820091994
Clayton Lake1620081977
Washburn1520051980
Waite1419771977
Big Twenty 21420092009
Charleston1320191977
Grnd Lk Strm1320001990
St David1120051982
Northfield1019811976
Forest Sta1020001978
Brooks920191977
Castine920051976
Harmony820241974

Winter Wren Population Trend in Other States

connecticutmarylandmassachusettsmichiganminnesotanew-hampshirenew-jerseynew-yorknorth-carolinaohiopennsylvaniatennesseevermontvirginiawest-virginiawisconsin

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.