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Species · Colorado · BBS 2026 Release · 1966–2025

Cassin's Kingbird Population Trend in Colorado

All statesAerial insectivores

Cassin's Kingbird in Colorado has edged up: up 13% on the route-weighted index since 1972.

+13%Since 1972TrendPercent 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 →
47Routes 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 →
52YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Cassin's Kingbird Trends in ColoradoNotable 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 Cassin's Kingbird in Colorado. See the full index history below.

Cassin's Kingbird Population Forecast in Colorado

If the recent trend holds, Cassin's Kingbird in Colorado is projected to fall about 56% by 2030 — from 1.4 in 2025 to a central estimate of 0.62 (95% range 0.00–1.3). A 5-year backtest shows a typical error of ±58.1%, with 60% of held-out values landing inside the 95% band.

-56%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 →
0.62Projected 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 →
0.00–1.395% 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 →
±58.1%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, Cassin's Kingbird in Colorado is projected to fall about 56% by 2030 — from 1.4 in 2025 to a central estimate of 0.62 (95% range 0.00–1.3). A 5-year backtest shows a typical error of ±58.1%, with 60% 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 →
20260.630.001.3
20270.630.001.3
20280.620.001.3
20290.620.001.3
20300.620.001.3

Cassin's Kingbird Survey Routes in Colorado

Routes recording Cassin's Kingbird in Colorado.
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 →
Cokedale3920251995
Ludlow3520251998
Walsenburg3020251996
Kiowa 21720252025
Mica Butte1419871968
Campo1320192018
Gilpin620251979
Edison619991989
Animas620041996
Mesaverde Np520252009
Rush420251987
Villegreen420241989
Dolores319721968
Animas 2320252005
Doyleville319891989
Hudson220032003
Doyle Bridge 2220191998
Adams Co.220222003
Crowley220221996
Gribbles Prk220251998
Ellicott220251999
Timpas220191995
Pritchett220252007
Wet Mtns.220251999
Angora220232021

Cassin's Kingbird Population Trend in Other States

arizonacaliforniakansasmontananebraskanevadanew-mexicooklahomasouth-dakotatexasutahwyoming

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