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

Pine Siskin Population Trend in Idaho

All statesGeneralists

Pine Siskin in Idaho has surged: up 164% on the route-weighted index since 1971.

+164%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 →
55YearsYears 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 164% 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 43% by 2029 — from 6.4 in 2024 to a central estimate of 3.6 (95% range 0.00–9.1). A 5-year backtest shows a typical error of ±46.5%, with 80% of held-out values landing inside the 95% band.

-43%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 →
3.6Projected 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 →
0.00–9.195% 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 →
±46.5%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, Pine Siskin in Idaho is projected to fall about 43% by 2029 — from 6.4 in 2024 to a central estimate of 3.6 (95% range 0.00–9.1). A 5-year backtest shows a typical error of ±46.5%, with 80% 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 →
20253.70.009.1
20263.70.009.1
20273.60.009.1
20283.60.009.1
20293.60.009.1

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
Rochat Divde4520231993
Naples3220241972
Cobalt3020241989
Challis2620241975
Coolin2320241986
Grangeville1620241987
Avery1420231979
Marble Creek1420231988
Alturas1319871968
Cape Horn1120241972
Lolo Pass620191992
Magic Mtn620241987
Featherville620241989
Pierce520071990
Sunbeam520191994
Centerville420191972
Twin Buttes420052005
Sawtooth City 2420242015
Joel420241990
Mivoden320231977
Craters319871987
Triangle320211987
Burgdorf320151988

Pine Siskin Population Trend in Other States

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

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