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

Common Grackle Population Trend in Nebraska

All statesGeneralists

Common Grackle in Nebraska has declined: down 30% on the route-weighted index since 1969.

-30%Since 1969TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
75Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
57YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Common Grackle Trends in NebraskaNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

No notable trend signals for Common Grackle in Nebraska. See the full index history below.

Common Grackle Population Forecast in Nebraska

If the recent trend holds, Common Grackle in Nebraska is projected to stay roughly flat through 2029, near 47 (95% range 24–70). A 5-year backtest shows a typical error of ±9.5%, with 100% of held-out values landing inside the 95% band.

+3%Change by 2029TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
47Projected 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
24–7095% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±9.5%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, Common Grackle in Nebraska is projected to stay roughly flat through 2029, near 47 (95% range 24–70). A 5-year backtest shows a typical error of ±9.5%, with 100% of held-out values landing inside the 95% band.19672029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
2025482571
2026482570
2027472570
2028472470
2029472470

Common Grackle Survey Routes in Nebraska

Routes recording Common Grackle in Nebraska.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →
Winside 226420222005
Kenesaw20820241967
Sumner14420241967
Surprise14420241967
Sparta13920211967
Hay Springs13020242018
Berwyn11220101993
Hampton11020242018
Gretna10820181967
Belvidere9720241967
Stratton9720241975
Paxton9620161967
Wheeler Co9220241978
Sargent8420242021
Petersburg7820231969
Berea7420191980
Kearney7220241968
Berwyn 26520212014
Maxwell5820242018
Dalton5720241968
Tilden5720242019
Richland5420241968
Crookston5220242018
Agate 25020242002
Johnstown4920241967

Common Grackle Population Trend in Other States

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

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