BirdAnalyst
Species · BCR 10 · BBS 2025 Release · 1966–2024

Common Grackle In Northern Rockies

All regionsNorthern RockiesGeneralists

Common Grackle in Northern Rockies has fallen sharply: down 66% on the route-weighted index since 1970.

-66%Since 1970
74Routes In Region
56Years

Notable Signals

long arc declinecomputed index

Common Grackle has fallen sharply in Northern Rockies: down 66% on the route-weighted index since 1970.

Forecast

If the recent trend holds, Common Grackle in Northern Rockies is projected to fall about 44% by 2029 — from 1.3 in 2024 to a central estimate of 0.72 (95% range 0.00–2.7). A 5-year backtest shows a typical error of ±38.3%, with 100% of held-out values landing inside the 95% band.

-44%Change by 2029
0.72Projected 2029 index
0.00–2.795% range
±38.3%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
20250.800.002.8
20260.780.002.8
20270.760.002.8
20280.740.002.7
20290.720.002.7

Routes In Northern Rockies

Routes recording Common Grackle in Northern Rockies.
CodyWYOMING242024
Church HillMONTANA202024
OttoWYOMING202024
MidvaleWYOMING202024
BasinWYOMING192024
MeeteetseWYOMING162024
ErvayWYOMING112009
WorlandWYOMING112024
St MaryMONTANA91971
PathfinderWYOMING92022
NowoodWYOMING81995
Rawlins 2WYOMING82016
KalispellMONTANA72024
Willow Creek 2MONTANA72024
Clyde ParkMONTANA72024
Patrick DrawWYOMING71974
Sand DrawWYOMING72018
BoulderMONTANA62024
Fort LoganMONTANA62022
ClarkWYOMING62011
WalcottWYOMING62021
FontenelleWYOMING51992
Elk HornWYOMING52018
EtheteWYOMING52024
LysiteWYOMING52024

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