BirdAnalyst
Species · BCR 30 · BBS 2025 Release · 1966–2024

Song Sparrow In New England / Mid-Atlantic Coast

All regionsNew England / Mid-Atlantic CoastGeneralists

Song Sparrow in New England / Mid-Atlantic Coast has held roughly steady: up 3% on the route-weighted index since 1968.

+3%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 →
159Routes 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 →
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 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 New England / Mid-Atlantic Coast. See the full index history below.

Song Sparrow In New England / Mid-Atlantic Coast Population Forecast

If the recent trend holds, Song Sparrow in New England / Mid-Atlantic Coast is projected to fall about 12% by 2029 — from 14 in 2024 to a central estimate of 12 (95% range 8.6–16). A 5-year backtest shows a typical error of ±14%, with 100% of held-out values landing inside the 95% band.

-12%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 →
12Projected 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 →
8.6–1695% 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 →
±14%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 New England / Mid-Atlantic Coast is projected to fall about 12% by 2029 — from 14 in 2024 to a central estimate of 12 (95% range 8.6–16). A 5-year backtest shows a typical error of ±14%, 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 →
2025138.916
2026138.816
2027128.716
2028128.716
2029128.616

Routes In New England / Mid-Atlantic Coast

Routes recording Song Sparrow in New England / Mid-Atlantic Coast.
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 →
Sachuest PtRHODE-ISLAND981990
WarrenCONNECTICUT802011
ManorvilleNEW-YORK772024
MansfieldMASSACHUSETTS522024
Wellfleet 2MASSACHUSETTS522024
ShermanCONNECTICUT512019
BelchertownMASSACHUSETTS502024
Jones BeachNEW-YORK482013
BrocktonMASSACHUSETTS472019
LargoMARYLAND461981
Long HillCONNECTICUT422019
PurdyNEW-YORK422022
Warren 2MASSACHUSETTS372024
ClarksvilleNEW-JERSEY371991
Bethany BchDELAWARE361990
Block IslandRHODE-ISLAND362010
SouthingtonCONNECTICUT352024
DanburyCONNECTICUT332023
ChilmarkMASSACHUSETTS331983
NewburyportMASSACHUSETTS332022
HuntingtonNEW-YORK332023
S BarreMASSACHUSETTS322024
WillimanticCONNECTICUT312018
GreenwichCONNECTICUT312018
MiltonDELAWARE312016

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