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

Gray Catbird Population Trend in Colorado

All statesGeneralists

Gray Catbird in Colorado has edged down: down 23% on the route-weighted index since 1971.

-23%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 →
62Routes 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 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 rise about 57% by 2029 — from 0.13 in 2024 to a central estimate of 0.21 (95% range 0.00–0.50). A 5-year backtest shows a typical error of ±33%, with 100% of held-out values landing inside the 95% band.

+57%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 →
0.21Projected 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 →
0.00–0.5095% 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 →
±33%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 rise about 57% by 2029 — from 0.13 in 2024 to a central estimate of 0.21 (95% range 0.00–0.50). A 5-year backtest shows a typical error of ±33%, with 100% of held-out values landing inside the 95% band.19692029
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 →
20250.210.000.50
20260.210.000.50
20270.210.000.50
20280.210.000.50
20290.210.000.50

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 →
Dolores419821971
Blackhead Pk420211992
Yampa320231987
Pagosa Spgs319761969
Angora320232022
Buford220221976
Aspen220242007
Falfa220221999
Tarryall220222008
Stillwater Pass 2220132013
Paonia220232014
Rifle Falls220212001
Radium220122012
Harmony120241976
Pinneo119771976
Douglas Pass120222022
Cheesman Lk120241970
Kiowa120021970
Colona120002000
Parlin120211999
Rio Grnds Rs120242024
Mica Butte119801980
Summitville120122012
Weston Pass 2120122012
Wray Gulch120232009

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 2026-05-22.