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

Brown Thrasher Population Trend in New Jersey

All statesGeneralists

Brown Thrasher in New Jersey has collapsed: down 90% on the route-weighted index since 1968.

-90%Since 1968
42Routes In State
58Years

Notable Brown Thrasher Trends in New Jersey

long arc declinecomputed index

Brown Thrasher has collapsed in New Jersey: down 90% on the route-weighted index since 1968.

Brown Thrasher Population Forecast in New Jersey

If the recent trend holds, Brown Thrasher in New Jersey is projected to fall about 100% by 2029 — from 0.67 in 2024 to a central estimate of 0.00 (95% range 0.00–2.7). A 5-year backtest shows a typical error of ±213.9%, with 100% of held-out values landing inside the 95% band.

-100%Change by 2029
0.00Projected 2029 index
0.00–2.795% range
±213.9%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

Brown Thrasher Survey Routes in New Jersey

Routes recording Brown Thrasher in New Jersey.
Spraguetown 21220072000
Deepwater719771969
Mt Misery519891976
Pedricktown 2520242013
Villas419811980
Cranbury320021987
Ancora219771966
Masonville219701966
Clarksville219831969
Pedricktown220121991
Winslow220231989
Ramseysburg220241995
Woodbury Hgt120231967
Greenwich120231966
Six Points120241979
Toms River119971966
Albion120221966
Bennett Mill120001966
Sandbrook120241969
Holmansville120091969
New Bedford120241969
Croton120071970
Robbinsville119731966
Hope119931970
Midvale119951967

Brown Thrasher Population Trend in Other States

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

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