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

Brown Creeper Population Trend in Colorado

All statesForest birds

Brown Creeper in Colorado has declined: down 29% on the route-weighted index since 1975.

-29%Since 1975TrendPercent 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 →
39Routes 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 →
39YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Brown Creeper 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 Brown Creeper in Colorado. See the full index history below.

Brown Creeper Population Forecast in Colorado

If the recent trend holds, Brown Creeper in Colorado is projected to stay roughly flat through 2029, near 0.07 (95% range 0.00–0.13). A 5-year backtest shows a typical error of ±175%, with 80% of held-out values landing inside the 95% band.

n/aChange 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 →
0.07Projected 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 →
0.00–0.1395% 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 →
±175%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, Brown Creeper in Colorado is projected to stay roughly flat through 2029, near 0.07 (95% range 0.00–0.13). A 5-year backtest shows a typical error of ±175%, with 80% 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 →
20250.070.000.13
20260.070.000.13
20270.070.000.13
20280.070.000.13
20290.070.000.13

Brown Creeper Survey Routes in Colorado

Routes recording Brown Creeper 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 →
Pinos Creek319891988
Powderhorn320142005
Owl Creek Pass320152012
Aspen220232023
Rosevale220172017
Parlin220181997
Pagosa Spgs219761976
Uncompahgre220142014
Pinon220151997
Mount Evans120192001
Cheesman Lk120151969
Delta120141983
Dolores119841984
Falfa119741974
Lost Lake120171993
Red Cliff120002000
Guffey120072007
Comanche Pk120002000
Dolores Riv120231996
Lake City119981998
Como120172017
Mcphee Res.120171999
South Fork120191996
Gold Hill 2120212019
Buffalo Park120231995

Brown Creeper Population Trend in Other States

alaskaarizonacaliforniaconnecticutidahoillinoisindianaiowamainemarylandmassachusettsmichiganminnesotamontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooregonpennsylvaniarhode-islandsouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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