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Species · BCR 14 · BBS 2026 Release · 1966–2025

Song Sparrow In Atlantic Northern Forest

All regionsAtlantic Northern ForestForest birds

Song Sparrow in Atlantic Northern Forest has edged down: down 17% on the route-weighted index since 1968.

-17%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 →
155Routes In RegionSurvey 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 SignalsNotable 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 Song Sparrow in Atlantic Northern Forest. See the full index history below.

Song Sparrow In Atlantic Northern Forest Population Forecast

If the recent trend holds, Song Sparrow in Atlantic Northern Forest is projected to fall about 42% by 2030 — from 23 in 2025 to a central estimate of 13 (95% range 6.3–20). A 5-year backtest shows a typical error of ±45%, with 0% of held-out values landing inside the 95% band.

-42%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 →
13Projected 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 →
6.3–2095% 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 →
±45%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, Song Sparrow in Atlantic Northern Forest is projected to fall about 42% by 2030 — from 23 in 2025 to a central estimate of 13 (95% range 6.3–20). A 5-year backtest shows a typical error of ±45%, 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 →
2026147.021
2027146.821
2028146.720
2029136.520
2030136.320

Routes In Atlantic Northern Forest

Routes recording Song Sparrow in Atlantic Northern Forest.
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 →
WashburnMAINE782005
Ft FairfieldMAINE612005
FletcherVERMONT562025
ChesterfieldMASSACHUSETTS482025
HardwickVERMONT482024
StoweVERMONT482024
East TroyMAINE462021
East HavenVERMONT452025
GaysvilleVERMONT442025
BrooksMAINE422021
LandgroveVERMONT422025
St DavidMAINE412005
S WallingfrdVERMONT412022
HarmonyMAINE402025
HermonMAINE402021
Turner 2MAINE392025
CornvilleMAINE392025
WalpoleNEW-HAMPSHIRE392025
W RutlandVERMONT392025
BoundaryMAINE372016
Bowdoin CtrMAINE362021
PittsfieldMASSACHUSETTS362016
MiddlesexVERMONT362025
GreensboroVERMONT362025
ConcordNEW-HAMPSHIRE342025

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