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Species · Colorado · BBS 2025 Release · 1966–2024

Western Wood-Pewee Population Trend in Colorado

All statesAerial insectivores

Western Wood-Pewee in Colorado has increased: up 25% on the route-weighted index since 1970.

+25%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 →
141Routes 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 →
56YearsYears 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 stay roughly flat through 2029, near 6.5 (95% range 4.6–8.4). A 5-year backtest shows a typical error of ±9.2%, with 100% of held-out values landing inside the 95% band.

+0%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 →
6.5Projected 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 →
4.6–8.495% 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 →
±9.2%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 stay roughly flat through 2029, near 6.5 (95% range 4.6–8.4). A 5-year backtest shows a typical error of ±9.2%, with 100% of held-out values landing inside the 95% band.19682029
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 →
20256.24.38.2
20266.34.48.2
20276.44.48.3
20286.44.58.4
20296.54.68.4

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 →
Cokedale6020241995
Ludlow4720161998
Walsenburg3920241994
Castleton3120241988
Wet Mtns.2920241993
Cortez 22920172009
Gardner2720241998
Gribbles Prk2620241994
Lake City 22420242017
Falfa2220241973
Elbert2220241998
Piedra2120241992
Cochetopa Pass2120241998
Guffey1920241990
Dolores Riv1920241988
Animas 21920212005
Westcliffe1820241998
Pagosa Spgs1619821968
Blackhead Pk1620211991
Moon Pass1620242003
Animas1520041996
Haycamp Mesa1520241998
Mcphee Res.1420241996
Owl Creek Pass1420241998
Parlin1320231968

Western Wood-Pewee Population Trend in Other States

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