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Species · Wyoming · BBS 2025 Release · 1966–2024

Yellow-headed Blackbird Population Trend in Wyoming

All statesGeneralists

Yellow-headed Blackbird in Wyoming has increased: up 29% on the route-weighted index since 1970.

+29%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 →
56YearsYears 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 55% by 2029 — from 1.0 in 2024 to a central estimate of 1.6 (95% range 0.00–3.5). A 5-year backtest shows a typical error of ±48.3%, with 100% of held-out values landing inside the 95% band.

+55%Change by 2029TrendPercent 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 →
1.6Projected 2029 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 →
±48.3%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 55% by 2029 — from 1.0 in 2024 to a central estimate of 1.6 (95% range 0.00–3.5). A 5-year backtest shows a typical error of ±48.3%, with 100% of held-out values landing inside the 95% band.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 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 →
20251.60.003.6
20261.60.003.6
20271.60.003.6
20281.60.003.6
20291.60.003.5

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 →
Harmony2320231980
Carter 22220242017
Seedskadee 21620242024
Yoder1520211968
Green River1419841977
Seedskadee1320231986
Mammoth1220241982
Boulder1220241982
Raven1120131992
Dwyer1020161992
Big Sandy1020241983
Crowheart920212003
Ne Entrance720211982
Flamin Gorge720232023
Mtn View620241980
Daniel519881980
Rock River520171996
Clarkelen419771977
Natrona419921968
Dayton420191981
Ethete420241992
Kaycee420222022
Rawlins419981988
Recluse320031982
Wilson320211983

Yellow-headed Blackbird Population Trend in Other States

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