BirdAnalyst
Species · BCR 29 · BBS 2025 Release · 1966–2024

Vesper Sparrow In Piedmont

All regionsPiedmontGrassland birds

Vesper Sparrow in Piedmont has collapsed: down 99% on the route-weighted index since 1968.

-99%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 →
34Routes 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 →

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 →

Vesper Sparrow has collapsed in Piedmont: down 99% on the route-weighted index since 1968.

Vesper Sparrow In Piedmont Population Forecast

If the recent trend holds, Vesper Sparrow in Piedmont is projected to stay roughly flat through 2029, near 0.00 (95% range 0.00–0.65). A 5-year backtest shows a typical error of ±2896.6%, with 100% of held-out values landing inside the 95% band.

n/aChange 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 →
0.00Projected 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 →
0.00–0.6595% 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 →
±2896.6%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, Vesper Sparrow in Piedmont is projected to stay roughly flat through 2029, near 0.00 (95% range 0.00–0.65). A 5-year backtest shows a typical error of ±2896.6%, 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 →
20250.000.000.65
20260.000.000.65
20270.000.000.65
20280.000.000.65
20290.000.000.65

Routes In Piedmont

Routes recording Vesper 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 →
JacobusPENNSYLVANIA31994
EmmitsburgMARYLAND22024
EkloMARYLAND22001
RandallstownMARYLAND21979
SandbrookNEW-JERSEY21969
AspersPENNSYLVANIA21984
GatchelvillePENNSYLVANIA21990
OlneyMARYLAND12008
WarfieldsbrgMARYLAND12006
Pleasant ValMARYLAND12010
Bachman MillMARYLAND12017
FowblesburgMARYLAND12011
Upper XrdsMARYLAND11992
TheodoreMARYLAND11994
IjamsvilleMARYLAND12015
Bald FriarMARYLAND11996
PottersvilleNEW-JERSEY11980
EphrataPENNSYLVANIA11981
Mt GretnaPENNSYLVANIA11989
PottstownPENNSYLVANIA11966
LabottPENNSYLVANIA11983
West GrovePENNSYLVANIA11967
Mount JoyPENNSYLVANIA12010
Mt Gretna 2PENNSYLVANIA12015
Brick TavernPENNSYLVANIA11996

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