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

Field Sparrow Population Trend in Connecticut

All statesGeneralists

Field Sparrow in Connecticut has collapsed: down 96% on the route-weighted index since 1968.

-96%Since 1968
19Routes In State
56Years

Notable Field Sparrow Trends in Connecticut

long arc declinecomputed index

Field Sparrow has collapsed in Connecticut: down 96% on the route-weighted index since 1968.

Field Sparrow Population Forecast in Connecticut

If the recent trend holds, Field Sparrow in Connecticut is projected to fall about 100% by 2029 — from 0.33 in 2024 to a central estimate of 0.00 (95% range 0.00–2.7). A 5-year backtest shows a typical error of ±875.5%, with 100% of held-out values landing inside the 95% band.

-100%Change by 2029
0.00Projected 2029 index
0.00–2.795% range
±875.5%Backtest error
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 index95% low95% high
20250.000.002.7
20260.000.002.7
20270.000.002.7
20280.000.002.7
20290.000.002.7

Field Sparrow Survey Routes in Connecticut

Routes recording Field Sparrow in Connecticut.
Greenwich519981967
Warren320091972
E Hartland219921966
Woodstock220041968
Westbrook219981972
Sherman220191972
Danbury219861968
New Hartford220171994
Warren 2220212016
Mystic120221973
Buckingham120081966
Uncasville120221973
Willimantic120181967
No Woodbury120241967
Long Hill120191972
Mid Haddam120241973
Southington120181973
New Hartford119871972
Granby120241988

Field Sparrow Population Trend in Other States

alabamaarkansascoloradodelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawest-virginiawisconsinwyoming

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