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

Common Grackle Population Trend in Delaware

All statesGeneralists

Common Grackle in Delaware has fallen sharply: down 54% on the route-weighted index since 1968.

-54%Since 1968
17Routes In State
58Years

Notable Common Grackle Trends in Delaware

long arc declinecomputed index

Common Grackle has fallen sharply in Delaware: down 54% on the route-weighted index since 1968.

Common Grackle Population Forecast in Delaware

If the recent trend holds, Common Grackle in Delaware is projected to rise about 42% by 2029 — from 84 in 2024 to a central estimate of 120 (95% range 12–228). A 5-year backtest shows a typical error of ±132.7%, with 100% of held-out values landing inside the 95% band.

+42%Change by 2029
120Projected 2029 index
12–22895% range
±132.7%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
202512618234
202612517233
202712315231
202812214230
202912012228

Common Grackle Survey Routes in Delaware

Routes recording Common Grackle in Delaware.
Lowes Xrds23819911966
Holleyville20420041966
Dover20019871966
Frankford16420121966
Milton 214920172017
Millsboro13920242017
Harrington12620241966
Milton12420161966
Bethany Bch6719901966
Holleyville 26520242006
Frederica6120141966
Pepperbox5820161998
Pepperbox 25220242017
Blackbird4020241994
Mt Pleasant3920191966
Wilmington3320141966
Georgetown2920221992

Common Grackle Population Trend in Other States

alabamaarkansascoloradoconnecticutfloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawest-virginiawisconsinwyoming

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