BirdAnalyst
Species · New Jersey · BBS 2025 Release · 1966–2024

Field Sparrow Population Trend in New Jersey

All statesGeneralists

Field Sparrow in New Jersey has fallen sharply: down 69% on the route-weighted index since 1968.

-69%Since 1968
41Routes In State
58Years

Notable Field Sparrow Trends in New Jersey

long arc declinecomputed index

Field Sparrow has fallen sharply in New Jersey: down 69% on the route-weighted index since 1968.

Field Sparrow Population Forecast in New Jersey

If the recent trend holds, Field Sparrow in New Jersey is projected to fall about 56% by 2029 — from 3.2 in 2024 to a central estimate of 1.4 (95% range 0.00–4.5). A 5-year backtest shows a typical error of ±49.5%, with 100% of held-out values landing inside the 95% band.

-56%Change by 2029
1.4Projected 2029 index
0.00–4.595% range
±49.5%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
20251.80.004.8
20261.70.004.8
20271.60.004.7
20281.50.004.6
20291.40.004.5

Field Sparrow Survey Routes in New Jersey

Routes recording Field Sparrow in New Jersey.
Croton1720071970
Hope1119941970
Pedricktown 21020242013
Pedricktown1020121991
Holmansville920091969
Villas919811979
Deepwater819771969
Ramseysburg820241995
High Point720241977
Cranbury720231993
Woodbury Hgt620241967
Sandbrook620241969
Croton 2620242008
Greenwich420241966
Spraguetown 2420072000
Mt Misery419881976
Winslow420241989
Toms River320241966
Ancora319771966
Masonville319701966
Kemah Lake320241966
Bloomsbury320241969
Cape May Ch320131992
Clarksville219911969
Robbinsville219791966

Field Sparrow Population Trend in Other States

alabamaarkansascoloradoconnecticutdelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanew-hampshirenew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawest-virginiawisconsinwyoming

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