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

American Pipit Population Trend in Colorado

All statesGeneralists

American Pipit in Colorado has surged: up 311% on the route-weighted index since 1991.

+311%Since 1991TrendPercent 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 →
16Routes 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 →
34YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable American Pipit 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 →

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 →

American Pipit has surged in Colorado: up 311% on the route-weighted index since 1991.

American Pipit Population Forecast in Colorado

If the recent trend holds, American Pipit in Colorado is projected to stay roughly flat through 2029, near 0.21 (95% range 0.00–0.60). A 5-year backtest shows a typical error of ±126.1%, with 100% of held-out values landing inside the 95% band.

+7%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 →
0.21Projected 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 →
0.00–0.6095% 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 →
±126.1%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, American Pipit in Colorado is projected to stay roughly flat through 2029, near 0.21 (95% range 0.00–0.60). A 5-year backtest shows a typical error of ±126.1%, with 100% of held-out values landing inside the 95% band.19862029
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 →
20250.210.000.61
20260.210.000.60
20270.210.000.60
20280.210.000.60
20290.210.000.60

American Pipit Survey Routes in Colorado

Routes recording American Pipit 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 →
Lake City1920031997
Mount Evans1820241996
Trail Ridge Road1520142003
Gold Hill919981998
Summitville320231992
Thomasville219931993
Como220142014
Tincup219991999
Marshall Pas220032003
Willow Peak119901990
Red Cliff120071991
Rollins Pass120031998
Uncompahgre120162016
Weston Pass 2120242005
Parlin119861986
Guanella Pas120162016

American Pipit Population Trend in Other States

alaskacaliforniamontananew-mexicoutahwashingtonwyoming

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