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Species · Utah · BBS 2025 Release · 1966–2024

Brewer's Blackbird Population Trend in Utah

All statesGeneralists

Brewer's Blackbird in Utah has fallen sharply: down 57% on the route-weighted index since 1970.

-57%Since 1970
94Routes In State
56Years

Notable Brewer's Blackbird Trends in Utah

long arc declinecomputed index

Brewer's Blackbird has fallen sharply in Utah: down 57% on the route-weighted index since 1970.

Brewer's Blackbird Population Forecast in Utah

If the recent trend holds, Brewer's Blackbird in Utah is projected to fall about 78% by 2029 — from 6.4 in 2024 to a central estimate of 1.4 (95% range 0.00–20). A 5-year backtest shows a typical error of ±46.5%, with 100% of held-out values landing inside the 95% band.

-78%Change by 2029
1.4Projected 2029 index
0.00–2095% range
±46.5%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
20253.20.0022
20262.80.0021
20272.30.0021
20281.90.0020
20291.40.0020

Brewer's Blackbird Survey Routes in Utah

Routes recording Brewer's Blackbird in Utah.
Kamas12320241997
M Warner Res6420241993
Ant Flat-Ogden Can6020231994
Randolph5720241992
Alton 22820242021
Hardware Ranch2220231994
Dixie Nf2120241993
Bicknell2020211997
Goose Creek Mtn.1820231997
Shivwitz1620141994
Crawford Mts1620172002
Altonah1420151969
Woodruff1420242002
Grouse Creek1220101982
Johnson Can1220241987
E. Bear Lake1220221995
Oak City1120231972
Goshen1120241968
Saleratus Cr1120181995
Wellington 31020242012
Wendover1020111987
Lost Cr. Res1020181996
Leamington920171992
Newcastle920221997
Neponset Res920171995

Brewer's Blackbird Population Trend in Other States

arizonacaliforniacoloradoidahoindianamichiganminnesotamontananebraskanevadanew-mexiconorth-dakotaoklahomaoregonsouth-dakotatexaswashingtonwisconsinwyoming

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