BirdAnalyst
Species · BCR 23 · BBS 2025 Release · 1966–2024

Brewer's Blackbird In Prairie Hardwood Transition

All regionsPrairie Hardwood TransitionGeneralists

Brewer's Blackbird in Prairie Hardwood Transition has collapsed: down 79% on the route-weighted index since 1968.

-79%Since 1968
65Routes In Region
58Years

Notable Signals

long arc declinecomputed index

Brewer's Blackbird has collapsed in Prairie Hardwood Transition: down 79% on the route-weighted index since 1968.

Forecast

If the recent trend holds, Brewer's Blackbird in Prairie Hardwood Transition is projected to rise about 63% by 2029 — from 0.28 in 2024 to a central estimate of 0.45 (95% range 0.00–1.6). A 5-year backtest shows a typical error of ±159.7%, with 100% of held-out values landing inside the 95% band.

+63%Change by 2029
0.45Projected 2029 index
0.00–1.695% range
±159.7%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
20250.570.001.7
20260.540.001.7
20270.510.001.6
20280.480.001.6
20290.450.001.6

Routes In Prairie Hardwood Transition

Routes recording Brewer's Blackbird in Prairie Hardwood Transition.
LoraineWISCONSIN222005
StratfordWISCONSIN92013
MinnetonkaMINNESOTA81996
OsseoMINNESOTA82017
EvergreenMINNESOTA82024
MerrillWISCONSIN82015
StetsonvilleWISCONSIN82024
Money CreekMINNESOTA71998
AshbyMINNESOTA72021
ManawaWISCONSIN62014
Mount HorebWISCONSIN61970
Buena VistaWISCONSIN62024
KnappMINNESOTA52002
CumberlandWISCONSIN52018
ViroquaWISCONSIN51976
PrincetonWISCONSIN51993
New TroyMICHIGAN41972
MillvilleMINNESOTA42019
HolwayWISCONSIN41989
GilmantonWISCONSIN41988
UnityWISCONSIN42023
PardeevilleWISCONSIN42022
MerideanWISCONSIN42019
GreshamWISCONSIN42011
CaledoniaMINNESOTA31996

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