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

Brown Thrasher Population Trend in Delaware

All statesGeneralists

Brown Thrasher in Delaware has increased: up 31% on the route-weighted index since 1968.

+31%Since 1968
17Routes In State
58Years

Notable Brown Thrasher Trends in Delaware

No notable trend signals for Brown Thrasher in Delaware. See the full index history below.

Brown Thrasher Population Forecast in Delaware

If the recent trend holds, Brown Thrasher in Delaware is projected to fall about 52% by 2029 — from 4.6 in 2024 to a central estimate of 2.2 (95% range 0.24–4.1). A 5-year backtest shows a typical error of ±43.6%, with 60% of held-out values landing inside the 95% band.

-52%Change by 2029
2.2Projected 2029 index
0.24–4.195% range
±43.6%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
20252.20.294.2
20262.20.284.2
20272.20.274.2
20282.20.264.1
20292.20.244.1

Brown Thrasher Survey Routes in Delaware

Routes recording Brown Thrasher in Delaware.
Milton 2820172017
Blackbird720241994
Pepperbox 2720242017
Holleyville 2420242006
Harrington320241966
Dover219871966
Holleyville220041966
Bethany Bch219901966
Millsboro220242017
Pepperbox220081998
Mt Pleasant120191966
Wilmington120141966
Frederica120131966
Frankford120121966
Lowes Xrds119801966
Milton120161967
Georgetown120221992

Brown Thrasher Population Trend in Other States

alabamaarkansascoloradoconnecticutfloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawest-virginiawisconsinwyoming

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