BirdAnalyst
Species · Vermont · BBS 2026 Release · 1966–2025

Chipping Sparrow Population Trend in Vermont

All statesForest birds

Chipping Sparrow in Vermont has held roughly steady: down 7% on the route-weighted index since 1968.

-7%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 →
26Routes 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 →
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 Chipping Sparrow Trends in VermontNotable 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 Vermont. See the full index history below.

Chipping Sparrow Population Forecast in Vermont

If the recent trend holds, Chipping Sparrow in Vermont is projected to fall about 28% by 2030 — from 12 in 2025 to a central estimate of 8.9 (95% range 4.6–13). A 5-year backtest shows a typical error of ±14.9%, with 100% of held-out values landing inside the 95% band.

-28%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 →
8.9Projected 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 →
4.6–1395% 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 →
±14.9%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 Vermont is projected to fall about 28% by 2030 — from 12 in 2025 to a central estimate of 8.9 (95% range 4.6–13). A 5-year backtest shows a typical error of ±14.9%, 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 →
20269.04.713
20278.94.613
20288.94.613
20298.94.613
20308.94.613

Chipping Sparrow Survey Routes in Vermont

Routes recording Chipping Sparrow in Vermont.
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 →
Bristol3420251995
Marlboro3320251966
Waterville1919801967
Shaftsbury1820251966
Fletcher1820251968
Hinesburg1419941966
Landgrove1320251966
East Haven1320251966
North Pownal1120251966
Greensboro1120251967
Gaysville1020251966
Northfld Fls1020251980
Newbury920041986
Stowe920241988
Stratton820251966
Middlesex820251968
Hardwick820241966
W Rutland720251966
St Johnsbury720251970
S Reading620241966
S Wallingfrd620221966
East Calais620251967
Post Mills520251966
Newbury 2520232005
Colchester420251986

Chipping Sparrow Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvirginiawashingtonwest-virginiawisconsinwyoming

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