BirdAnalyst
Species · Colorado · BBS 2026 Release · 1966–2025

Gray Catbird Population Trend in Colorado

All statesForest birds

Gray Catbird in Colorado has edged down: down 11% on the route-weighted index since 1971.

-11%Since 1971TrendPercent 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 →
66Routes 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 →
55YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Gray Catbird 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 Gray Catbird in Colorado. See the full index history below.

Gray Catbird Population Forecast in Colorado

If the recent trend holds, Gray Catbird in Colorado is projected to fall about 49% by 2030 — from 0.45 in 2025 to a central estimate of 0.23 (95% range 0.00–0.53). A 5-year backtest shows a typical error of ±38.4%, with 100% of held-out values landing inside the 95% band.

-49%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 →
0.23Projected 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 →
0.00–0.5395% 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 →
±38.4%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, Gray Catbird in Colorado is projected to fall about 49% by 2030 — from 0.45 in 2025 to a central estimate of 0.23 (95% range 0.00–0.53). A 5-year backtest shows a typical error of ±38.4%, with 100% of held-out values landing inside the 95% band.19692030
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 →
20260.230.000.52
20270.230.000.52
20280.230.000.53
20290.230.000.53
20300.230.000.53

Gray Catbird Survey Routes in Colorado

Routes recording Gray Catbird 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 →
Yellowjacket Pass1320251998
Blackhead Pk720251992
Rifle Falls520252001
Dolores419821971
Yampa320231987
Pagosa Spgs319761969
Tarryall320252008
Angora320232022
Harmony220251976
Buford220251976
Aspen220242007
Parlin220251999
Falfa220221999
Wilson Creek220252010
Steamboat L.220252025
Ragged Mtn.220252004
Stillwater Pass 2220132013
Paonia220252014
Groundhog Rs220252025
Radium220122012
Pinneo119771976
Douglas Pass120222022
Cheesman Lk120241970
Kiowa120021970
Colona120002000

Gray Catbird Population Trend in Other States

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

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