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Species · Montana · BBS 2025 Release · 1966–2024

American Three-toed Woodpecker Population Trend in Montana

All statesForest birds

American Three-toed Woodpecker in Montana has declined: down 37% on the route-weighted index since 1992.

-37%Since 1992TrendPercent 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 →
19Routes 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 →
28YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable American Three-toed Woodpecker 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 →

No notable trend signals for American Three-toed Woodpecker in Montana. See the full index history below.

American Three-toed Woodpecker Population Forecast in Montana

If the recent trend holds, American Three-toed Woodpecker in Montana is projected to stay roughly flat through 2029, near 0.05 (95% range 0.00–0.11). A 5-year backtest shows a typical error of ±59.3%, with 100% of held-out values landing inside the 95% band.

n/aChange 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 →
0.05Projected 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 →
0.00–0.1195% 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 →
±59.3%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, American Three-toed Woodpecker in Montana is projected to stay roughly flat through 2029, near 0.05 (95% range 0.00–0.11). A 5-year backtest shows a typical error of ±59.3%, with 100% of held-out values landing inside the 95% band.19772029
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 →
20250.050.000.11
20260.050.000.11
20270.050.000.11
20280.050.000.11
20290.050.000.11

American Three-toed Woodpecker Survey Routes in Montana

Routes recording American Three-toed Woodpecker 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 →
Sula420141992
Greenough219991996
St Regis220051999
Arlee220171977
Pagil Gulch220242015
Logan Pass120102010
Threemile Wa120102010
Elevation Mt120222004
Pryor Mtn.120231995
Woodman120211991
Inside Road120231991
Skalkho-Rye120222004
Swan Lake120212021
Greenoagh 2120082008
Greenoagh 3120222022
Ninemile120152001
Fish Creek120022002
Hebgen Lake120212021
Noxon120182018

American Three-toed Woodpecker Population Trend in Other States

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