BirdAnalyst
Species · Colorado · BBS 2026 Release · 1966–2025

Chipping Sparrow Population Trend in Colorado

All statesForest birds

Chipping Sparrow in Colorado has surged: up 172% on the route-weighted index since 1970.

+172%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 →
112Routes 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 Chipping Sparrow 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 →

Chipping Sparrow has surged in Colorado: up 172% on the route-weighted index since 1970.

Chipping Sparrow Population Forecast in Colorado

If the recent trend holds, Chipping Sparrow in Colorado is projected to rise about 11% by 2030 — from 4.7 in 2025 to a central estimate of 5.2 (95% range 3.4–7.0). A 5-year backtest shows a typical error of ±30%, with 100% of held-out values landing inside the 95% band.

+11%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 →
5.2Projected 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 →
3.4–7.095% 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 →
±30%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, Chipping Sparrow in Colorado is projected to rise about 11% by 2030 — from 4.7 in 2025 to a central estimate of 5.2 (95% range 3.4–7.0). A 5-year backtest shows a typical error of ±30%, 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 →
20265.03.26.8
20275.13.26.9
20285.13.36.9
20295.23.37.0
20305.23.47.0

Chipping Sparrow Survey Routes in Colorado

Routes recording Chipping Sparrow 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 →
Mcphee Res.3620251996
Alamosa2719921992
Rifle Falls2720251998
Aspen2420251979
Pinon1920251992
Lake City 21820252016
Animas 21520252005
Douglas Pass1420241982
Gribbles Prk1420251994
Dunckley Pas1320251993
Animas1320041996
Ludlow1320251998
Blackhead Pk1220251991
Buffalo Park1220251992
Owl Creek Pass1220251998
Delta1120211973
Wet Mtns.1120251993
Haycamp Mesa1120251998
Cone Mtn1020182018
Deadman Rd.1020251992
De Beque1020251992
Thomasville1020251992
South Fork1020251994
Gold Hill1020121998
Gardner1020251998

Chipping Sparrow Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniaconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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