BirdAnalyst
Species · BCR 16 · BBS 2025 Release · 1966–2024

Common Grackle In Southern Rockies / Colorado Plateau

All regionsSouthern Rockies / Colorado PlateauGeneralists

Common Grackle in Southern Rockies / Colorado Plateau has fallen sharply: down 65% on the route-weighted index since 1971.

-65%Since 1971
80Routes In Region
55Years

Notable Signals

long arc declinecomputed index

Common Grackle has fallen sharply in Southern Rockies / Colorado Plateau: down 65% on the route-weighted index since 1971.

Forecast

If the recent trend holds, Common Grackle in Southern Rockies / Colorado Plateau is projected to rise about 11% by 2029 — from 0.30 in 2024 to a central estimate of 0.33 (95% range 0.00–1.7). A 5-year backtest shows a typical error of ±243.8%, with 100% of held-out values landing inside the 95% band.

+11%Change by 2029
0.33Projected 2029 index
0.00–1.795% range
±243.8%Backtest error
19682029
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
20250.420.001.8
20260.400.001.8
20270.380.001.8
20280.360.001.7
20290.330.001.7

Routes In Southern Rockies / Colorado Plateau

Routes recording Common Grackle in Southern Rockies / Colorado Plateau.
HarmonyCOLORADO232024
ParlinCOLORADO162018
Fletcher PkWYOMING102024
PowderhornCOLORADO92001
BrookhurstWYOMING92019
Colona 2COLORADO82021
SummitvilleCOLORADO81994
CapulinNEW-MEXICO81993
Baxter PassCOLORADO72013
Wilson CreekCOLORADO62018
Weston PassCOLORADO62000
AnimasCOLORADO62000
ValenciaNEW-MEXICO61997
TarryallCOLORADO52022
Angel FireNEW-MEXICO52002
MoabUTAH51998
HannaUTAH52001
FruitaCOLORADO42007
Dunckley PasCOLORADO42024
Deadman Rd.COLORADO41994
MoscaCOLORADO41999
Gold HillCOLORADO42012
Sybille CynWYOMING42014
YampaCOLORADO32023
BufordCOLORADO32022

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