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Species · Colorado · BBS 2026 Release · 1966–2025

Western Wood-Pewee Population Trend in Colorado

All statesAerial insectivores

Western Wood-Pewee in Colorado has increased: up 41% on the route-weighted index since 1970.

+41%Since 1970TrendPercent 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 →
142Routes 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 →
57YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Western Wood-Pewee 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 Western Wood-Pewee in Colorado. See the full index history below.

Western Wood-Pewee Population Forecast in Colorado

If the recent trend holds, Western Wood-Pewee in Colorado is projected to fall about 13% by 2030 — from 7.7 in 2025 to a central estimate of 6.7 (95% range 4.7–8.6). A 5-year backtest shows a typical error of ±10.1%, with 100% of held-out values landing inside the 95% band.

-13%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 →
6.7Projected 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 →
4.7–8.695% 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 →
±10.1%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, Western Wood-Pewee in Colorado is projected to fall about 13% by 2030 — from 7.7 in 2025 to a central estimate of 6.7 (95% range 4.7–8.6). A 5-year backtest shows a typical error of ±10.1%, with 100% of held-out values landing inside the 95% band.19682030
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 →
20266.44.58.4
20276.54.58.4
20286.54.68.5
20296.64.68.6
20306.74.78.6

Western Wood-Pewee Survey Routes in Colorado

Routes recording Western Wood-Pewee 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 →
Walsenburg5820251994
Cokedale5420251995
Tarryall3420251988
Parlin3320251968
Wet Mtns.3120251993
Cortez 22920172009
Elbert2620251998
Castleton2520251988
Blackhead Pk2520251991
Dolores Riv2220251988
Ragged Mtn.2220251994
Gardner2220251998
Gribbles Prk2120251994
Haycamp Mesa2120251998
Ludlow2120251998
Kiowa 22020252019
Falfa1920251973
Lake City 21920252017
Aspen1720251979
Animas 21720252005
Pagosa Spgs1619821968
Deadman Rd.1620251992
Animas1520041996
Owl Creek Pass1520251998
Dunckley Pas1420251992

Western Wood-Pewee Population Trend in Other States

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