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

Savannah Sparrow Population Trend in Maine

All statesGrassland birds

Savannah Sparrow in Maine has declined: down 48% on the route-weighted index since 1968.

-48%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 →
57Routes 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 Savannah Sparrow 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 Savannah Sparrow in Maine. See the full index history below.

Savannah Sparrow Population Forecast in Maine

If the recent trend holds, Savannah Sparrow in Maine is projected to stay roughly flat through 2029, near 1.6 (95% range 0.00–4.2). A 5-year backtest shows a typical error of ±30.2%, with 100% of held-out values landing inside the 95% band.

+3%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 →
1.6Projected 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 →
0.00–4.295% 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 →
±30.2%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, Savannah Sparrow in Maine is projected to stay roughly flat through 2029, near 1.6 (95% range 0.00–4.2). A 5-year backtest shows a typical error of ±30.2%, 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 →
20251.80.004.4
20261.80.004.3
20271.70.004.3
20281.70.004.2
20291.60.004.2

Savannah Sparrow Survey Routes in Maine

Routes recording Savannah Sparrow 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 →
Washburn5620051979
Boundary2720161993
Ft Fairfield2220051993
Ludlow2019981968
Ashland1820081980
St David1120051982
Deblois1020071966
Harmony920241967
Otisfield Gr720141977
Cornville720242012
Bethel620191977
Manchester619951971
Hermon620191966
Cooper620211975
Topsfield619961991
Benton419781971
Hancock420241969
Northfield419811976
Cambridge420081968
Wytopitlock419981978
Forest Sta420001978
Reeds320241990
Bowdoin Ctr320211972
East Troy320191973
Charleston320181975

Savannah Sparrow Population Trend in Other States

alaskaarizonacaliforniacoloradoconnecticutdelawareidahoillinoisindianaiowakansaskentuckymarylandmassachusettsmichiganminnesotamissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooregonpennsylvaniarhode-islandsouth-dakotatennesseeutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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