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Species · Colorado · BBS 2026 Release · 1966–2025

Pine Siskin Population Trend in Colorado

All statesForest birds

Pine Siskin in Colorado has increased: up 30% on the route-weighted index since 1970.

+30%Since 1970TrendPercent 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 →
95Routes 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 →
57YearsYears 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 ColoradoNotable 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 Siskin in Colorado. See the full index history below.

Pine Siskin Population Forecast in Colorado

If the recent trend holds, Pine Siskin in Colorado is projected to rise about 22% by 2030 — from 5.8 in 2025 to a central estimate of 7.1 (95% range 2.2–12). A 5-year backtest shows a typical error of ±102.5%, with 100% of held-out values landing inside the 95% band.

+22%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 →
7.1Projected 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 →
2.2–1295% 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 →
±102.5%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 Colorado is projected to rise about 22% by 2030 — from 5.8 in 2025 to a central estimate of 7.1 (95% range 2.2–12). A 5-year backtest shows a typical error of ±102.5%, with 100% 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 →
20266.92.012
20277.02.112
20287.02.112
20297.02.112
20307.12.212

Pine Siskin Survey Routes in Colorado

Routes recording Pine Siskin in Colorado.
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 →
Tincup6720251992
Stillwater Pass6120091998
Dolores Riv3920251988
Willow Peak3320251988
Lake City 23120252016
Owl Creek Pass3020251998
Pinos Creek2719901988
Stillwater Pass 22720252010
Heeney 22620252025
Castleton2520251988
Guanella Pas2420251992
Groundhog Rs2320251992
Dunckley Pas2220251992
Steamboat L.2220251996
Red Cliff2120251989
Thomasville2020251992
Weston Pass2020001994
Lizard Head Pass2020252001
Haycamp Mesa1820251998
Heeney1720192017
Gold Hill1620121998
Deadman Rd.1520251992
Buffalo Park1420251992
Delta1320211973
Weston Pass 21320252001

Pine Siskin Population Trend in Other States

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

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