BirdAnalyst
Species · BCR 29 · BBS 2026 Release · 1966–2025

Field Sparrow In Piedmont

All regionsPiedmontForest birds

Field Sparrow in Piedmont has collapsed: down 76% on the route-weighted index since 1968.

-76%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 →
170Routes 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 Piedmont: down 76% on the route-weighted index since 1968.

Field Sparrow In Piedmont Population Forecast

If the recent trend holds, Field Sparrow in Piedmont is projected to fall about 61% by 2030 — from 5.2 in 2025 to a central estimate of 2.0 (95% range 0.00–5.8). A 5-year backtest shows a typical error of ±41.4%, with 100% of held-out values landing inside the 95% band.

-61%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 →
2.0Projected 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 →
0.00–5.895% 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 →
±41.4%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 Piedmont is projected to fall about 61% by 2030 — from 5.2 in 2025 to a central estimate of 2.0 (95% range 0.00–5.8). A 5-year backtest shows a typical error of ±41.4%, 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 →
20262.90.006.7
20272.70.006.5
20282.50.006.2
20292.30.006.0
20302.00.005.8

Routes In Piedmont

Routes recording Field Sparrow in Piedmont.
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 →
CherryvilleNORTH-CAROLINA351968
Ft Pickett NVIRGINIA301995
PendletonSOUTH-CAROLINA291976
Stoney PointGEORGIA272007
OwingsSOUTH-CAROLINA262004
TrymeVIRGINIA252025
MetasvilleGEORGIA232000
MooresvilleNORTH-CAROLINA222001
AspersPENNSYLVANIA211989
Hulls XroadsNORTH-CAROLINA202023
EmmitsburgMARYLAND182025
CrotonNEW-JERSEY172007
LabottPENNSYLVANIA161983
ChesneeSOUTH-CAROLINA162015
CampobelloSOUTH-CAROLINA152025
ConcordVIRGINIA152024
Nixburg 2ALABAMA142025
MadonnaMARYLAND142022
OstwaltNORTH-CAROLINA142025
Boiling SpgsSOUTH-CAROLINA141979
Ft Pickett SVIRGINIA141995
Liberty CityALABAMA132011
Croton 2NEW-JERSEY132025
MannboroVIRGINIA132025
Taylorstown 2VIRGINIA132025

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