BirdAnalyst
Species · Delaware · BBS 2025 Release · 1966–2024

Chipping Sparrow Population Trend in Delaware

All statesGeneralists

Chipping Sparrow in Delaware has increased: up 49% on the route-weighted index since 1968.

+49%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 →
17Routes In StateSurvey 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 Chipping Sparrow Trends in DelawareNotable 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 Chipping Sparrow in Delaware. See the full index history below.

Chipping Sparrow Population Forecast in Delaware

If the recent trend holds, Chipping Sparrow in Delaware is projected to stay roughly flat through 2029, near 30 (95% range 20–40). A 5-year backtest shows a typical error of ±17%, with 80% of held-out values landing inside the 95% band.

-7%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 →
30Projected 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 →
20–4095% 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 →
±17%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, Chipping Sparrow in Delaware is projected to stay roughly flat through 2029, near 30 (95% range 20–40). A 5-year backtest shows a typical error of ±17%, with 80% 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 →
2025291939
2026291939
2027291940
2028302040
2029302040

Chipping Sparrow Survey Routes in Delaware

Routes recording Chipping Sparrow in Delaware.
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 →
Holleyville5620041966
Millsboro4120242017
Milton 24020172017
Pepperbox3620161998
Holleyville 23320242006
Pepperbox 23220242017
Frederica3020141966
Milton3020161966
Harrington2820241966
Mt Pleasant2720191966
Frankford2720121966
Blackbird2720241994
Georgetown2620221992
Lowes Xrds1619911966
Wilmington420141966
Dover419871966
Bethany Bch319901966

Chipping Sparrow Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutfloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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