BirdAnalyst
Species · BCR 12 · BBS 2025 Release · 1966–2024

Brewer's Blackbird In Boreal Hardwood Transition

All regionsBoreal Hardwood TransitionGeneralists

Brewer's Blackbird in Boreal Hardwood Transition has collapsed: down 78% on the route-weighted index since 1968.

-78%Since 1968
98Routes In Region
58Years

Notable Signals

long arc declinecomputed index

Brewer's Blackbird has collapsed in Boreal Hardwood Transition: down 78% on the route-weighted index since 1968.

Forecast

If the recent trend holds, Brewer's Blackbird in Boreal Hardwood Transition is projected to stay roughly flat through 2029, near 0.54 (95% range 0.00–2.3). A 5-year backtest shows a typical error of ±36.9%, with 100% of held-out values landing inside the 95% band.

+1%Change by 2029
0.54Projected 2029 index
0.00–2.395% range
±36.9%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
20250.810.002.6
20260.740.002.5
20270.670.002.4
20280.600.002.4
20290.540.002.3

Routes In Boreal Hardwood Transition

Routes recording Brewer's Blackbird in Boreal Hardwood Transition.
Lake CityMICHIGAN382001
BemidjiMINNESOTA241979
ShanagoldenWISCONSIN171984
GreenbushMINNESOTA122024
CathroMICHIGAN101990
NebishMINNESOTA92023
Amnicon FallsWISCONSIN92018
Ned LakeMICHIGAN82015
HermanMICHIGAN81997
RacoMICHIGAN81990
MareniscoMICHIGAN71995
Brocky LakeMICHIGAN71987
Red OakMICHIGAN72007
DebsMINNESOTA72013
TahquamenonMICHIGAN61990
Pleasant Valley 2MICHIGAN62005
Wigwam BayMINNESOTA61995
WaskishMINNESOTA61997
Tamarac NwrMINNESOTA61992
IrmaWISCONSIN62010
Crystal FlsMICHIGAN52017
Pine RiverMINNESOTA52024
HovlandMINNESOTA51983
Island LakeMINNESOTA51995
Nett LakeMINNESOTA52024

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