BirdAnalyst
Species · Montana · BBS 2025 Release · 1966–2024

Pine Grosbeak Population Trend in Montana

All statesGeneralists

Pine Grosbeak in Montana has declined: down 34% on the route-weighted index since 1983.

-34%Since 1983TrendPercent 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 →
35YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Pine Grosbeak 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 Pine Grosbeak in Montana. See the full index history below.

Pine Grosbeak Population Forecast in Montana

If the recent trend holds, Pine Grosbeak in Montana is projected to stay roughly flat through 2028, near 0.05 (95% range 0.00–0.15). A 5-year backtest shows a typical error of ±110.9%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2028TrendPercent 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 2028 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.1595% 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 →
±110.9%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, Pine Grosbeak in Montana is projected to stay roughly flat through 2028, near 0.05 (95% range 0.00–0.15). A 5-year backtest shows a typical error of ±110.9%, with 100% of held-out values landing inside the 95% band.19802028
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 →
20240.050.000.15
20250.050.000.15
20260.050.000.15
20270.050.000.15
20280.050.000.15

Pine Grosbeak Survey Routes in Montana

Routes recording Pine Grosbeak 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 →
Skalkho-Rye420222001
Logan Pass220191980
Victor220151997
Ninemile220101997
Skalkaho219951993
Libby Dam119881983
Greenough119991999
Elevation Mt120181996
St Regis119911981
Arlee120041986
Woodman120152015
Elliston120172017
Inside Road120091996
Sula120131999
Whitefish Lake120232018
Greenoagh 2120102010
Greenoagh 3120222022
Thompson Riv120192019
Painted Rock120052005

Pine Grosbeak Population Trend in Other States

alaskaarizonacaliforniacoloradoidahomaineminnesotanevadanew-mexicooregonutahwashingtonwisconsinwyoming

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