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Species · Colorado · BBS 2026 Release · 1966–2025

Hairy Woodpecker Population Trend in Colorado

All statesForest birds

Hairy Woodpecker in Colorado has surged: up 241% on the route-weighted index since 1971.

+241%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 →
92Routes 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 Hairy Woodpecker 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 →

Hairy Woodpecker has surged in Colorado: up 241% on the route-weighted index since 1971.

Hairy Woodpecker Population Forecast in Colorado

If the recent trend holds, Hairy Woodpecker in Colorado is projected to rise about 41% by 2030 — from 0.43 in 2025 to a central estimate of 0.60 (95% range 0.40–0.81). A 5-year backtest shows a typical error of ±19.5%, with 100% of held-out values landing inside the 95% band.

+41%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 →
0.60Projected 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 →
0.40–0.8195% 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 →
±19.5%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, Hairy Woodpecker in Colorado is projected to rise about 41% by 2030 — from 0.43 in 2025 to a central estimate of 0.60 (95% range 0.40–0.81). A 5-year backtest shows a typical error of ±19.5%, 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 →
20260.570.360.77
20270.570.370.78
20280.580.380.79
20290.590.390.80
20300.600.400.81

Hairy Woodpecker Survey Routes in Colorado

Routes recording Hairy Woodpecker 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 →
Comanche Pk720241995
Gold Hill720121998
Deadman Rd.420251996
Cokedale420251995
Gold Hill 2420252018
Cheesman Lk320251969
Parlin320231979
Baxter Pass320242024
Marshall Pas320191995
Yampa220211982
Buford220231983
Aspen220251995
Delta220211978
Dolores219761976
Pagosa Spgs219741970
Villegreen220042004
Blackhead Pk220251991
Buffalo Park220251992
Thomasville220251997
Pinon220251992
Groundhog Rs220251992
Steamboat L.220121998
Basin220242007
Rollins Pass220222008
Elbert220251998

Hairy Woodpecker Population Trend in Other States

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

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