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

Pine Siskin Population Trend in Colorado

All statesGeneralists

Pine Siskin in Colorado has held roughly steady: up 10% on the route-weighted index since 1970.

+10%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 →
94Routes 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 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 106% by 2029 — from 3.5 in 2024 to a central estimate of 7.1 (95% range 2.2–12). A 5-year backtest shows a typical error of ±115.5%, with 60% of held-out values landing inside the 95% band.

+106%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 →
7.1Projected 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 →
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 →
±115.5%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 106% by 2029 — from 3.5 in 2024 to a central estimate of 7.1 (95% range 2.2–12). A 5-year backtest shows a typical error of ±115.5%, with 60% 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 →
20257.02.012
20267.02.112
20277.02.112
20287.12.112
20297.12.212

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 →
Buffalo Park7220231992
Stillwater Pass6120091998
Lake City 23620242016
Ragged Mtn.3020191994
Pinos Creek2719901988
Castleton2420241988
Dunckley Pas2120241992
Weston Pass2020001994
Haycamp Mesa1920241998
Stillwater Pass 21920242010
Dolores Riv1820241988
Pinon1720241992
Heeney1720192017
Gold Hill1620121998
Lizard Head Pass1620242001
Lost Lake1420241990
Groundhog Rs1420241992
Powderhorn1420231994
Delta1320211973
Fox Creek1320241993
Rifle Falls1320191998
Owl Creek Pass1220241998
Red Cliff1120241989
Cokedale1120191996
Maybell1019851985

Pine Siskin Population Trend in Other States

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

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