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Species · California · BBS 2026 Release · 1966–2025

Western Wood-Pewee Population Trend in California

All statesAerial insectivores

Western Wood-Pewee in California has edged down: down 18% on the route-weighted index since 1970.

-18%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 →
219Routes 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 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 31% by 2030 — from 5.9 in 2025 to a central estimate of 7.7 (95% range 5.5–9.9). A 5-year backtest shows a typical error of ±50.3%, with 0% of held-out values landing inside the 95% band.

+31%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 →
7.7Projected 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 →
5.5–9.995% 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 →
±50.3%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 31% by 2030 — from 5.9 in 2025 to a central estimate of 7.7 (95% range 5.5–9.9). A 5-year backtest shows a typical error of ±50.3%, with 0% 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 →
20267.85.510
20277.85.510.0
20287.75.510.0
20297.75.510.0
20307.75.59.9

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 Truckee7520251997
Chilcoot5820241998
Horse Creek5320191970
Last Chance5220191993
Macdoel4820191972
Genesee4720241972
Paxton4320251998
Cottage Spgs3619751968
Woodfords3620251972
Greenhorn Mt3620081971
Goumaz3620111997
Eagle Lake3520251969
Pine Mountain3420171997
Lake Hemet3219861970
White River3219921972
Johnsville2920251975
Fallsvale2919811970
Honeydew2520171968
Valyermo2520191970
Westville2420251971
Mt Pinos2420041969
Meadow Valley2320251999
Carrville2219701970
Likely2220251972
Lakeshore2220241972

Western Wood-Pewee Population Trend in Other States

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