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

Boat-tailed Grackle Population Trend in Delaware

All statesGeneralists

Boat-tailed Grackle in Delaware has edged up: up 14% on the route-weighted index since 1968.

+14%Since 1968
9Routes In State
54Years

Notable Boat-tailed Grackle Trends in Delaware

No notable trend signals for Boat-tailed Grackle in Delaware. See the full index history below.

Boat-tailed Grackle Population Forecast in Delaware

If the recent trend holds, Boat-tailed Grackle in Delaware is projected to fall about 50% by 2029 — from 4.0 in 2024 to a central estimate of 2.0 (95% range 0.00–8.3). A 5-year backtest shows a typical error of ±41.5%, with 100% of held-out values landing inside the 95% band.

-50%Change by 2029
2.0Projected 2029 index
0.00–8.395% range
±41.5%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
20252.10.008.5
20262.10.008.4
20272.00.008.4
20282.00.008.4
20292.00.008.3

Boat-tailed Grackle Survey Routes in Delaware

Routes recording Boat-tailed Grackle in Delaware.
Bethany Bch6419901966
Harrington2020241967
Holleyville 21020092006
Lowes Xrds919861968
Blackbird820151994
Milton419711971
Georgetown420211995
Dover219791974
Pepperbox120041999

Boat-tailed Grackle Population Trend in Other States

alabamafloridageorgialouisianamarylandmississippinew-jerseynew-yorknorth-carolinasouth-carolinatexasvirginia

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