BirdAnalyst
Species · Nebraska · BBS 2026 Release · 1966–2025

Common Grackle Population Trend in Nebraska

All statesGeneralists

Common Grackle in Nebraska has declined: down 29% on the route-weighted index since 1969.

-29%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 →
76Routes 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 →
58YearsYears 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 2030, near 47 (95% range 24–69). A 5-year backtest shows a typical error of ±6.4%, with 100% of held-out values landing inside the 95% band.

-2%Change by 2030TrendPercent 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 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
24–6995% 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 →
±6.4%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 2030, near 47 (95% range 24–69). A 5-year backtest shows a typical error of ±6.4%, with 100% of held-out values landing inside the 95% band.19672030
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 →
2026482570
2027472570
2028472570
2029472470
2030472469

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
Surprise21720251967
Kenesaw20920251967
Kimball17420251975
Berea14120251980
Sumner13120251967
Hay Springs12920252018
Kearney11520251968
Berwyn11220101993
Gretna10820181967
Wheeler Co10020251978
Paxton9620161967
Arthur9520251985
Hampton9020252018
Dalton8820251968
Madison8420252018
Stratton8120251975
Sargent7820252021
Johnstown7720251967
Table7420251973
Belvidere7320251967
Sparta7020251967
Irvington6120251967
Murray Lake5020251987
Murdock5020252018

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 2026-08-14.