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

Pine Grosbeak Population Trend in Colorado

All statesGeneralists

Pine Grosbeak in Colorado has increased: up 26% on the route-weighted index since 1983.

+26%Since 1983TrendPercent 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 →
47Routes 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 →
39YearsYears 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 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 Grosbeak in Colorado. See the full index history below.

Pine Grosbeak Population Forecast in Colorado

If the recent trend holds, Pine Grosbeak in Colorado is projected to fall about 10% by 2029 — from 0.30 in 2024 to a central estimate of 0.27 (95% range 0.03–0.51). A 5-year backtest shows a typical error of ±63.9%, with 100% of held-out values landing inside the 95% band.

-10%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 →
0.27Projected 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 →
0.03–0.5195% 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 →
±63.9%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 Colorado is projected to fall about 10% by 2029 — from 0.30 in 2024 to a central estimate of 0.27 (95% range 0.03–0.51). A 5-year backtest shows a typical error of ±63.9%, with 100% of held-out values landing inside the 95% band.19722029
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 →
20250.270.030.51
20260.270.030.51
20270.270.030.51
20280.270.030.51
20290.270.030.51

Pine Grosbeak Survey Routes in Colorado

Routes recording Pine Grosbeak 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 →
Willow Peak520181988
Como520241994
Haycamp Mesa520222006
Lake City 2520242022
Mount Evans420241996
Mesaverde Np420042004
Trail Ridge Road420112004
Red Cliff420241989
Steamboat L.320041996
Pinos Creek319901988
South Fork320241994
Buffalo Park320231992
Flattops320151994
Radium320121998
Rio Grnds Rs220122012
Summitville220241992
Lost Lake220191996
Dolores Riv220241988
Lake City220021988
Stillwater Pass 2220232010
Dunckley Pas219951992
Deadman Rd.220221995
Tincup220241992
Yampa120222022
Douglas Pass120162016

Pine Grosbeak Population Trend in Other States

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