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Species · Wyoming · BBS 2026 Release · 1966–2025

Yellow-headed Blackbird Population Trend in Wyoming

All statesWetland birds

Yellow-headed Blackbird in Wyoming has edged up: up 22% on the route-weighted index since 1970.

+22%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 →
90Routes 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 Yellow-headed 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 →

No notable trend signals for Yellow-headed Blackbird in Wyoming. See the full index history below.

Yellow-headed Blackbird Population Forecast in Wyoming

If the recent trend holds, Yellow-headed Blackbird in Wyoming is projected to rise about 30% by 2030 — from 1.2 in 2025 to a central estimate of 1.5 (95% range 0.00–3.5). A 5-year backtest shows a typical error of ±27.4%, with 100% of held-out values landing inside the 95% band.

+30%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 →
1.5Projected 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 →
0.00–3.595% 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 →
±27.4%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, Yellow-headed Blackbird in Wyoming is projected to rise about 30% by 2030 — from 1.2 in 2025 to a central estimate of 1.5 (95% range 0.00–3.5). A 5-year backtest shows a typical error of ±27.4%, 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 →
20261.60.003.5
20271.60.003.5
20281.60.003.5
20291.60.003.5
20301.50.003.5

Yellow-headed Blackbird Survey Routes in Wyoming

Routes recording Yellow-headed 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 →
Lusk2520251982
Boulder1820251982
Seedskadee 21620242024
Mtn View1420251980
Green River1419841977
Harmony1320251980
Seedskadee1320231986
Raven1120131992
Carter 21120252017
Dwyer1020161992
Big Sandy1020241983
Crowheart920212003
Mammoth720251982
Ethete720251992
Flamin Gorge720232023
Daniel519881980
Kaycee520252022
Rock River520171996
Clarkelen419771977
Natrona419921968
Dayton420191981
Rawlins419981988
Recluse320031982
Wilson320211983
Lysite320081989

Yellow-headed Blackbird Population Trend in Other States

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