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

Chipping Sparrow Population Trend in Colorado

All statesGeneralists

Chipping Sparrow in Colorado has surged: up 152% on the route-weighted index since 1970.

+152%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 →
110Routes 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 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 152% 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 24% by 2029 — from 4.2 in 2024 to a central estimate of 5.2 (95% range 3.3–7.0). A 5-year backtest shows a typical error of ±40.6%, with 60% of held-out values landing inside the 95% band.

+24%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 →
5.2Projected 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 →
3.3–7.095% 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 →
±40.6%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 24% by 2029 — from 4.2 in 2024 to a central estimate of 5.2 (95% range 3.3–7.0). A 5-year backtest shows a typical error of ±40.6%, 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 →
20255.03.26.8
20265.03.26.9
20275.13.36.9
20285.13.37.0
20295.23.37.0

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.4020241996
Alamosa2719921992
Buffalo Park2020231992
Ludlow2020161998
De Beque1620241992
Pinon1620241992
Wet Mtns.1620241993
Haycamp Mesa1620241998
Douglas Pass1420241982
Nucla1420241999
Animas1320041996
Aspen1220241979
Delta1120211973
Fox Creek1120241993
Gribbles Prk1120241994
Angora1120241998
Uncompahgre1020241988
Cone Mtn1020182018
Flattops1020191992
Gold Hill1020121998
Lizard Head Pass1020242001
Mesaverde Np1020241996
Cheesman Lk920241969
Wray Gulch920231988
Deadman Rd.920241992

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 2026-05-22.