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Species · Montana · BBS 2025 Release · 1966–2024

Western Wood-Pewee Population Trend in Montana

All statesAerial insectivores

Western Wood-Pewee in Montana has surged: up 329% on the route-weighted index since 1970.

+329%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 →
107Routes 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 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 329% 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 2029, near 5.2 (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.

+9%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 →
5.2Projected 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 →
4.0–6.595% 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 2029, near 5.2 (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.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 →
20255.03.76.2
20265.03.86.3
20275.13.86.4
20285.23.96.4
20295.24.06.5

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 Point3220241977
Ninemile2920241993
Clyde Park2720242018
Sula2520241978
Custer2320222019
Pablo Res.1720241995
Freeman Creek1720162015
Kalispell1620241968
Chuffey Spring1620242016
Custer 21620242024
Highwood1520241979
Painted Rock1320221992
Wise River1320241998
Augusta1220241976
Brusett1120241982
Clancy1120232015
Brandenberg1020191968
Maynard Coulee1020242017
Church Hill1020242017
Forsyth920231980
Wolf Creek920222015
Willow Creek 2820241983
Heart Butte820242015
Victor820241993
Glen720241977

Western Wood-Pewee Population Trend in Other States

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