BirdAnalyst
Species · BCR 30 · BBS 2026 Release · 1966–2025

Field Sparrow In New England / Mid-Atlantic Coast

All regionsNew England / Mid-Atlantic CoastForest birds

Field Sparrow in New England / Mid-Atlantic Coast has collapsed: down 84% on the route-weighted index since 1968.

-84%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 →
158Routes 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 →

long arc declinecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Field Sparrow has collapsed in New England / Mid-Atlantic Coast: down 83% on the route-weighted index since 1968.

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

If the recent trend holds, Field Sparrow in New England / Mid-Atlantic Coast is projected to fall about 100% by 2030 — from 1.8 in 2025 to a central estimate of 0.00 (95% range 0.00–2.8). A 5-year backtest shows a typical error of ±114.5%, with 100% of held-out values landing inside the 95% band.

-100%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 →
0.00Projected 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 →
0.00–2.895% 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 →
±114.5%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, Field Sparrow in New England / Mid-Atlantic Coast is projected to fall about 100% by 2030 — from 1.8 in 2025 to a central estimate of 0.00 (95% range 0.00–2.8). A 5-year backtest shows a typical error of ±114.5%, with 100% 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 →
20260.000.002.8
20270.000.002.8
20280.000.002.8
20290.000.002.8
20300.000.002.8

Routes In New England / Mid-Atlantic Coast

Routes recording Field 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 →
Pedricktown 2NEW-JERSEY152025
Pt RepublicMARYLAND141989
Lowes XrdsDELAWARE121991
HughesvilleMARYLAND112025
PedricktownNEW-JERSEY102012
BlackbirdDELAWARE92025
La PlataMARYLAND92009
HolmansvilleNEW-JERSEY92009
VillasNEW-JERSEY91981
BrandonVIRGINIA92025
MadisonMARYLAND82025
Snow HillMARYLAND81976
DeepwaterNEW-JERSEY81977
TruhartVIRGINIA82024
Holleyville 2DELAWARE72024
CheltenhamMARYLAND72004
QuinbyVIRGINIA72025
HolleyvilleDELAWARE62004
HarmonyMARYLAND62017
Forest GroveMARYLAND62023
WalnutMARYLAND62024
White StoneVIRGINIA62025
WalkersVIRGINIA62023
GreenwichCONNECTICUT51998
SinepuxentMARYLAND51978

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