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

Chipping Sparrow Population Trend in Connecticut

All statesGeneralists

Chipping Sparrow in Connecticut has increased: up 30% on the route-weighted index since 1968.

+30%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 →
20Routes 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 ConnecticutNotable 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 Connecticut. See the full index history below.

Chipping Sparrow Population Forecast in Connecticut

If the recent trend holds, Chipping Sparrow in Connecticut is projected to rise about 39% by 2029 — from 26 in 2024 to a central estimate of 36 (95% range 25–47). A 5-year backtest shows a typical error of ±42.9%, with 40% of held-out values landing inside the 95% band.

+39%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 →
36Projected 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 →
25–4795% 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 →
±42.9%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 Connecticut is projected to rise about 39% by 2029 — from 26 in 2024 to a central estimate of 36 (95% range 25–47). A 5-year backtest shows a typical error of ±42.9%, with 40% 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 →
2025352346
2026352446
2027352447
2028362447
2029362547

Chipping Sparrow Survey Routes in Connecticut

Routes recording Chipping Sparrow in Connecticut.
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 →
Warren7720111972
Uncasville6920241973
Mid Haddam4220241973
Sherman4120191972
Willimantic3320181967
Greenwich3320181967
Long Hill3120191972
Woodstock3020071968
Woodstock 22320242016
New Hartford2220241994
Buckingham2020221966
No Woodbury2020241967
New Hartford1819871972
Westbrook1620241969
Mystic1520231973
Southington1520241973
Granby1520241988
E Hartland1319921966
Danbury1320231968
Warren 21220242012

Chipping Sparrow Population Trend in Other States

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

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