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

Pine Grosbeak Population Trend in Idaho

All statesGeneralists

Pine Grosbeak in Idaho has fallen sharply: down 70% on the route-weighted index since 1987.

-70%Since 1987TrendPercent 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 →
10Routes 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 →
22YearsYears 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 IdahoNotable 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 declinecomputed 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 →

Pine Grosbeak has fallen sharply in Idaho: down 70% on the route-weighted index since 1987.

Pine Grosbeak Population Forecast in Idaho

If the recent trend holds, Pine Grosbeak in Idaho is projected to stay roughly flat through 2027, near 0.00 (95% range 0.00–0.10). A 5-year backtest shows a typical error of ±202.6%, with 80% of held-out values landing inside the 95% band.

n/aChange by 2027TrendPercent 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 →
0.00Projected 2027 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.1095% 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 →
±202.6%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 Idaho is projected to stay roughly flat through 2027, near 0.00 (95% range 0.00–0.10). A 5-year backtest shows a typical error of ±202.6%, with 80% of held-out values landing inside the 95% band.19692027
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 →
20230.000.000.11
20240.000.000.10
20250.000.000.10
20260.000.000.10
20270.000.000.10

Pine Grosbeak Survey Routes in Idaho

Routes recording Pine Grosbeak in Idaho.
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 →
Lolo Pass420191994
Golden219871987
Alturas219691969
Mivoden119891981
Avery119931992
Marble Creek119901990
Rochat Divde120221993
Cape Horn119871987
Nezperce Nf119991999
Cobalt119931991

Pine Grosbeak Population Trend in Other States

alaskaarizonacaliforniacoloradomaineminnesotamontananevadanew-mexicooregonutahwashingtonwisconsinwyoming

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