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Species · Wyoming · BBS 2026 Release · 1966–2025

Brewer's Blackbird Population Trend in Wyoming

All statesGeneralists

Brewer's Blackbird in Wyoming has fallen sharply: down 55% on the route-weighted index since 1970.

-55%Since 1970TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
134Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
57YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Brewer's Blackbird Trends in WyomingNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

long arc declinecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Brewer's Blackbird has fallen sharply in Wyoming: down 55% on the route-weighted index since 1970.

Brewer's Blackbird Population Forecast in Wyoming

If the recent trend holds, Brewer's Blackbird in Wyoming is projected to stay roughly flat through 2030, near 12 (95% range 0.99–24). A 5-year backtest shows a typical error of ±20.6%, with 100% of held-out values landing inside the 95% band.

+8%Change by 2030TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
12Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.99–2495% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±20.6%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, Brewer's Blackbird in Wyoming is projected to stay roughly flat through 2030, near 12 (95% range 0.99–24). A 5-year backtest shows a typical error of ±20.6%, with 100% of held-out values landing inside the 95% band.19682030
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
2026131.925
2027131.624
2028131.424
2029131.224
2030120.9924

Brewer's Blackbird Survey Routes in Wyoming

Routes recording Brewer's Blackbird in Wyoming.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →
Nowood15220251988
Bill6720181974
Lusk6420251984
Buford5120251974
Daniel5119881980
Boulder5120251982
Green River3819841977
Rozet3820251991
Meeteetse3720251991
Gvnt Valley3620251992
Sybille Cyn3520251980
Patrick Draw3319801973
Bucknum3220241993
Diamondville3119821977
Soda Well2820251979
Dubois2720251968
Harmony2720251980
Fletcher Pk2520251979
Fontenelle2420251982
Newcastle2420251988
Seely2320001990
Natrona2219921968
Warbonnet2120251990
Glenrock2019771968
Dwyer2020251992

Brewer's Blackbird Population Trend in Other States

arizonacaliforniacoloradoidahoindianamichiganminnesotamontananebraskanevadanew-mexiconorth-dakotaoklahomaoregonsouth-dakotatexasutahwashingtonwisconsin

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.