BirdAnalyst
Species · Colorado · BBS 2025 Release · 1966–2024

Common Yellowthroat Population Trend in Colorado

All statesForest birds

Common Yellowthroat in Colorado has surged: up 168% on the route-weighted index since 1972.

+168%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 →
78Routes 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 →
54YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Common Yellowthroat 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 →

long arc increasecomputed 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 →

Common Yellowthroat has surged in Colorado: up 168% on the route-weighted index since 1972.

Common Yellowthroat Population Forecast in Colorado

If the recent trend holds, Common Yellowthroat in Colorado is projected to fall about 30% by 2029 — from 0.59 in 2024 to a central estimate of 0.41 (95% range 0.12–0.70). A 5-year backtest shows a typical error of ±16.3%, with 100% of held-out values landing inside the 95% band.

-30%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 →
0.41Projected 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 →
0.12–0.7095% 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 →
±16.3%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, Common Yellowthroat in Colorado is projected to fall about 30% by 2029 — from 0.59 in 2024 to a central estimate of 0.41 (95% range 0.12–0.70). A 5-year backtest shows a typical error of ±16.3%, with 100% of held-out values landing inside the 95% band.19702029
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 →
20250.410.120.70
20260.410.120.70
20270.410.120.70
20280.410.120.70
20290.410.120.70

Common Yellowthroat Survey Routes in Colorado

Routes recording Common Yellowthroat 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 →
Blackhead Pk2120211999
Buford620241986
Falfa620241971
Fort Morgan520241996
Browns Park420241992
Angora420241998
Arsenal 2420242017
Maybell320241985
Yampa320231975
Douglas Pass320241982
Alamosa320241988
Summitville320002000
Paonia320241992
Cokedale320242003
Yellowjacket Pass320241999
Cortez 2320172009
Kiowa220151987
Lamar220241981
Dolores219821971
Wilson Creek220151999
Red Cliff220162001
Tarryall220181995
Flattops220062002
Piedra220222010
Powderhorn220082000

Common Yellowthroat Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniaconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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