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

Grasshopper Sparrow In New England / Mid-Atlantic Coast

All regionsNew England / Mid-Atlantic CoastGrassland birds

Grasshopper Sparrow in New England / Mid-Atlantic Coast has declined: down 39% on the route-weighted index since 1968.

-39%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 →
99Routes 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 Grasshopper Sparrow in New England / Mid-Atlantic Coast. See the full index history below.

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

If the recent trend holds, Grasshopper Sparrow in New England / Mid-Atlantic Coast is projected to stay roughly flat through 2030, near 2.1 (95% range 0.94–3.3). A 5-year backtest shows a typical error of ±16.2%, with 100% of held-out values landing inside the 95% band.

-7%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 →
2.1Projected 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 →
0.94–3.395% 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 →
±16.2%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, Grasshopper Sparrow in New England / Mid-Atlantic Coast is projected to stay roughly flat through 2030, near 2.1 (95% range 0.94–3.3). A 5-year backtest shows a typical error of ±16.2%, 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 →
20262.10.913.3
20272.10.923.3
20282.10.933.3
20292.10.933.3
20302.10.943.3

Routes In New England / Mid-Atlantic Coast

Routes recording Grasshopper 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 →
HarmonyMARYLAND462017
CokesburyMARYLAND192025
QuinbyVIRGINIA192025
HongaMARYLAND172025
NewarkMARYLAND122025
FredericaDELAWARE102025
MillsboroDELAWARE102025
MardelaMARYLAND102019
Golden HillMARYLAND82025
SharpsVIRGINIA82025
Mt PleasantDELAWARE72019
BerlinMARYLAND72025
Milton 2DELAWARE62025
Pt RepublicMARYLAND61989
WalnutMARYLAND62024
White StoneVIRGINIA62025
BlackbirdDELAWARE52025
Holleyville 2DELAWARE52024
MillingtonMARYLAND52025
FrankfordDELAWARE42012
MiltonDELAWARE42016
PepperboxDELAWARE42008
Tall TimbersMARYLAND42014
HughesvilleMARYLAND42025
Piney NeckMARYLAND42025

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