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Species · California · BBS 2025 Release · 1966–2024

Western Wood-Pewee Population Trend in California

All statesAerial insectivores

Western Wood-Pewee in California has edged down: down 22% on the route-weighted index since 1970.

-22%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 →
217Routes 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 CaliforniaNotable 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 California. See the full index history below.

Western Wood-Pewee Population Forecast in California

If the recent trend holds, Western Wood-Pewee in California is projected to rise about 36% by 2029 — from 5.8 in 2024 to a central estimate of 7.9 (95% range 5.7–10). A 5-year backtest shows a typical error of ±43.8%, with 20% of held-out values landing inside the 95% band.

+36%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 →
7.9Projected 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 →
5.7–1095% 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 →
±43.8%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 California is projected to rise about 36% by 2029 — from 5.8 in 2024 to a central estimate of 7.9 (95% range 5.7–10). A 5-year backtest shows a typical error of ±43.8%, with 20% 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 →
20257.95.710
20267.95.710
20277.95.710
20287.95.710
20297.95.710

Western Wood-Pewee Survey Routes in California

Routes recording Western Wood-Pewee in California.
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 →
Little Truckee8020231997
Chilcoot5820241998
Eagle Lake5520241969
Horse Creek5320191970
Last Chance5220191993
Macdoel4820191972
Genesee4720241972
Woodfords4120241972
Cottage Spgs3619751968
Greenhorn Mt3620081971
Goumaz3620111997
Pine Mountain3420171997
Paxton3320241998
Lake Hemet3219861970
White River3219921972
Fallsvale2919811970
Johnsville2820241975
Honeydew2520171968
Valyermo2520191970
Mt Pinos2420041969
Carrville2219701970
Sattley2220241972
Lakeshore2220241972
Iron Gate2220191988
Westville1920241971

Western Wood-Pewee Population Trend in Other States

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