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

Yellow Warbler Population Trend in Delaware

All statesForest birds

Yellow Warbler in Delaware has edged down: down 11% on the route-weighted index since 1968.

-11%Since 1968
14Routes In State
57Years

Notable Yellow Warbler Trends in Delaware

No notable trend signals for Yellow Warbler in Delaware. See the full index history below.

Yellow Warbler Population Forecast in Delaware

If the recent trend holds, Yellow Warbler in Delaware is projected to rise about 12% by 2029 — from 1.0 in 2024 to a central estimate of 1.1 (95% range 0.00–2.3). A 5-year backtest shows a typical error of ±106.8%, with 100% of held-out values landing inside the 95% band.

+12%Change by 2029
1.1Projected 2029 index
0.00–2.395% range
±106.8%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
20251.10.002.3
20261.10.002.3
20271.10.002.3
20281.10.002.3
20291.10.002.3

Yellow Warbler Survey Routes in Delaware

Routes recording Yellow Warbler in Delaware.
Frankford420081968
Dover219791968
Lowes Xrds219771970
Bethany Bch219891966
Blackbird220241994
Holleyville 2220242024
Mt Pleasant120121966
Wilmington120111967
Harrington120241966
Frederica120071966
Holleyville119971969
Milton120141970
Pepperbox120161999
Georgetown120171992

Yellow Warbler Population Trend in Other States

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

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