BirdAnalyst
Species · BCR 22 · BBS 2025 Release · 1966–2024

Common Grackle In Eastern Tallgrass Prairie

All regionsEastern Tallgrass PrairieGeneralists

Common Grackle in Eastern Tallgrass Prairie has fallen sharply: down 71% on the route-weighted index since 1968.

-71%Since 1968
278Routes In Region
58Years

Notable Signals

long arc declinecomputed index

Common Grackle has fallen sharply in Eastern Tallgrass Prairie: down 71% on the route-weighted index since 1968.

Forecast

If the recent trend holds, Common Grackle in Eastern Tallgrass Prairie is projected to rise about 37% by 2029 — from 31 in 2024 to a central estimate of 43 (95% range 18–67). A 5-year backtest shows a typical error of ±82.9%, with 0% of held-out values landing inside the 95% band.

+37%Change by 2029
43Projected 2029 index
18–6795% range
±82.9%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
2025472371
2026462270
2027452169
2028442068
2029431867

Routes In Eastern Tallgrass Prairie

Routes recording Common Grackle in Eastern Tallgrass Prairie.
MilroyINDIANA4142024
HarveysburgOHIO3911996
WilmingtonOHIO2871996
NewportOHIO2741994
AtkinsonILLINOIS2502024
W CarrolltonOHIO2092015
Marion 2OHIO2022024
PlainfieldINDIANA1711999
FairburyILLINOIS1592024
TecumsehOHIO1531982
PontiacILLINOIS1472024
Sni MillsMISSOURI1461990
GridleyILLINOIS1442024
TiptonINDIANA1431992
MonticelloILLINOIS1362024
StreatorILLINOIS1222024
DunlapOHIO1171988
DesmoinesIOWA1101979
GretnaNEBRASKA1082018
KalidaOHIO1062019
Witts StationINDIANA1042024
Kings CreekOHIO992015
ShelbyvilleINDIANA972024
ThrallKANSAS971970
Ash CreekMINNESOTA942024

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