BirdAnalyst
Species · BCR 19 · BBS 2026 Release · 1966–2025

Common Grackle In Central Mixed Grass Prairie

All regionsCentral Mixed Grass PrairieGeneralists

Common Grackle in Central Mixed Grass Prairie has edged down: down 16% on the route-weighted index since 1969.

-16%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 →
130Routes In RegionSurvey 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 SignalsNotable 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 Central Mixed Grass Prairie. See the full index history below.

Common Grackle In Central Mixed Grass Prairie Population Forecast

If the recent trend holds, Common Grackle in Central Mixed Grass Prairie is projected to fall about 21% by 2030 — from 31 in 2025 to a central estimate of 25 (95% range 11–39). A 5-year backtest shows a typical error of ±13.2%, with 100% of held-out values landing inside the 95% band.

-21%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 →
25Projected 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 →
11–3995% 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 →
±13.2%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 Central Mixed Grass Prairie is projected to fall about 21% by 2030 — from 31 in 2025 to a central estimate of 25 (95% range 11–39). A 5-year backtest shows a typical error of ±13.2%, 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 →
2026261240
2027261240
2028251139
2029251139
2030251139

Routes In Central Mixed Grass Prairie

Routes recording Common Grackle in Central Mixed Grass Prairie.
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 →
SurpriseNEBRASKA2172025
KenesawNEBRASKA2092025
CovertKANSAS1332025
SumnerNEBRASKA1312025
KearneyNEBRASKA1152025
BerwynNEBRASKA1122010
Wheeler CoNEBRASKA1002025
ArthurNEBRASKA952025
HamptonNEBRASKA902025
StrattonNEBRASKA812025
SargentNEBRASKA782025
JohnstownNEBRASKA772025
TableNEBRASKA742025
BelvidereNEBRASKA732025
ColonyOKLAHOMA711995
GrayKANSAS642019
MisslerKANSAS632019
Beloit 2KANSAS622018
Liberty 2NEBRASKA492007
SewardNEBRASKA482025
ChapmanKANSAS461981
HodgesKANSAS442014
WellingtonKANSAS432025
WeinertTEXAS411994
HopewellKANSAS392018

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.