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Species · Montana · BBS 2026 Release · 1966–2025

Western Wood-Pewee Population Trend in Montana

All statesAerial insectivores

Western Wood-Pewee in Montana has surged: up 324% on the route-weighted index since 1970.

+324%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 →
108Routes 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 MontanaNotable 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 →

Western Wood-Pewee has surged in Montana: up 324% on the route-weighted index since 1970.

Western Wood-Pewee Population Forecast in Montana

If the recent trend holds, Western Wood-Pewee in Montana is projected to stay roughly flat through 2030, near 5.3 (95% range 4.0–6.5). A 5-year backtest shows a typical error of ±9.5%, with 100% of held-out values landing inside the 95% band.

+2%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 →
5.3Projected 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 →
4.0–6.595% 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 →
±9.5%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, Western Wood-Pewee in Montana is projected to stay roughly flat through 2030, near 5.3 (95% range 4.0–6.5). A 5-year backtest shows a typical error of ±9.5%, 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 →
20265.03.86.3
20275.13.96.4
20285.23.96.4
20295.24.06.5
20305.34.06.5

Western Wood-Pewee Survey Routes in Montana

Routes recording Western Wood-Pewee in Montana.
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 →
Reed Point4820251977
Clyde Park2920252018
Ninemile2720251993
Kalispell2620251968
Sula2520241978
Chuffey Spring2520252016
Custer2320222019
Miles City2020252015
Custer 22020252024
Victor1820251993
Freeman Creek1720162015
Highwood1420251979
Painted Rock1320221992
Willow Creek 21320251983
Brusett1120241982
Church Hill1120252017
East Glacier Park1020252015
Clancy1020252015
Fort Logan1020252018
Woodman920251968
Forsyth920231980
Brandenberg920251968
Wise River920251998
Wolf Creek920222015
Maynard Coulee820252017

Western Wood-Pewee Population Trend in Other States

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