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Species · Idaho · BBS 2026 Release · 1966–2025

Pine Siskin Population Trend in Idaho

All statesForest birds

Pine Siskin in Idaho has surged: up 185% on the route-weighted index since 1971.

+185%Since 1971TrendPercent 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 →
53Routes 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 Pine Siskin 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 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 →

Pine Siskin has surged in Idaho: up 185% on the route-weighted index since 1971.

Pine Siskin Population Forecast in Idaho

If the recent trend holds, Pine Siskin in Idaho is projected to fall about 51% by 2030 — from 8.4 in 2025 to a central estimate of 4.1 (95% range 0.00–9.7). A 5-year backtest shows a typical error of ±52.4%, with 40% of held-out values landing inside the 95% band.

-51%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 →
4.1Projected 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 →
0.00–9.795% 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 →
±52.4%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 Siskin in Idaho is projected to fall about 51% by 2030 — from 8.4 in 2025 to a central estimate of 4.1 (95% range 0.00–9.7). A 5-year backtest shows a typical error of ±52.4%, with 40% 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 →
20264.10.009.7
20274.10.009.7
20284.10.009.7
20294.10.009.7
20304.10.009.7

Pine Siskin Survey Routes in Idaho

Routes recording Pine Siskin 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 →
Cascade7519841968
Deep Creek6119851985
Challis4220251975
Cobalt3620251989
Avery3520251979
Marble Creek3520251988
Sunbeam2620251994
Naples2320251972
Magic Mtn2020251987
Mivoden1820251977
Coolin1720251986
Alturas1319871968
Rochat Divde1320251993
Featherville1020251989
Cabarton1020241985
Lolo Pass620191992
Grangeville520251987
Pierce520071990
Ririe420252021
Twin Buttes420052005
Sawtooth City 2420242015
Joel420241990
Burgdorf420251988
Cape Horn320251972
Craters319871987

Pine Siskin Population Trend in Other States

alaskaarizonacaliforniacoloradoconnecticutiowamainemarylandmassachusettsmichiganminnesotamontananebraskanevadanew-hampshirenew-mexiconew-yorknorth-carolinanorth-dakotaohiooregonpennsylvaniarhode-islandsouth-dakotatennesseeutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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