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

Great-tailed Grackle In Southern Rockies / Colorado Plateau

All regionsSouthern Rockies / Colorado PlateauGeneralists

Great-tailed Grackle in Southern Rockies / Colorado Plateau has fallen sharply: down 67% on the route-weighted index since 1973.

-67%Since 1973
32Routes In Region
48Years

Notable Signals

long arc declinecomputed index

Great-tailed Grackle has fallen sharply in Southern Rockies / Colorado Plateau: down 67% on the route-weighted index since 1973.

Forecast

If the recent trend holds, Great-tailed Grackle in Southern Rockies / Colorado Plateau is projected to fall about 64% by 2029 — from 0.13 in 2024 to a central estimate of 0.05 (95% range 0.00–0.33). A 5-year backtest shows a typical error of ±111.5%, with 100% of held-out values landing inside the 95% band.

-64%Change by 2029
0.05Projected 2029 index
0.00–0.3395% range
±111.5%Backtest error
19712029
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
20250.070.000.35
20260.060.000.35
20270.060.000.34
20280.050.000.34
20290.050.000.33

Routes In Southern Rockies / Colorado Plateau

Routes recording Great-tailed Grackle in Southern Rockies / Colorado Plateau.
ValenciaNEW-MEXICO251997
SeligmanARIZONA112024
DoloresCOLORADO41987
AlamosaCOLORADO42024
Ojo SarcoNEW-MEXICO32017
HatchUTAH32008
San LuisCOLORADO22023
Cortez 2COLORADO22014
CebollaNEW-MEXICO22022
ShiprockNEW-MEXICO22000
Stinking Lk.NEW-MEXICO21995
AztecNEW-MEXICO21989
Angel Fire 2NEW-MEXICO22018
Willow CreekUTAH21997
MoabUTAH22001
HannaUTAH22024
Wellington 3UTAH22013
HuntARIZONA12000
Castle ButteARIZONA11995
Peach SpringARIZONA12023
MoffatCOLORADO12010
FalfaCOLORADO12011
Pagosa SpgsCOLORADO11982
FruitaCOLORADO12007
CortezCOLORADO12008

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