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

Chipping Sparrow Population Trend in Idaho

All statesForest birds

Chipping Sparrow in Idaho has surged: up 94% on the route-weighted index since 1970.

+94%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 →
59Routes 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 IdahoNotable 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 Idaho: up 94% on the route-weighted index since 1970.

Chipping Sparrow Population Forecast in Idaho

If the recent trend holds, Chipping Sparrow in Idaho is projected to fall about 21% by 2030 — from 8.9 in 2025 to a central estimate of 7.1 (95% range 3.5–11). A 5-year backtest shows a typical error of ±19.6%, with 100% of held-out values landing inside the 95% band.

-21%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 →
7.1Projected 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 →
3.5–1195% 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 →
±19.6%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 Idaho is projected to fall about 21% by 2030 — from 8.9 in 2025 to a central estimate of 7.1 (95% range 3.5–11). A 5-year backtest shows a typical error of ±19.6%, 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 →
20267.03.410
20277.03.511
20287.03.511
20297.13.511
20307.13.511

Chipping Sparrow Survey Routes in Idaho

Routes recording Chipping Sparrow in Idaho.
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 →
Cascade6919841968
Coolin2820251986
Cabarton2720241985
Magic Mtn2620251987
Centerville2420251972
Cobalt2220251989
Mivoden2120251977
Deep Creek2019851985
Featherville2020251989
Gifford1920171971
Cape Horn1720251972
Grangeville1620251986
Dougal Res1620251988
Sunbeam1520251994
Avery1420251979
Naples1320251972
Alturas1319871968
Sawtooth Cty1320141988
Rochat Divde1220251993
Marble Creek1220251988
Challis1120251976
Baldy Mountain1120162013
Burgdorf1120251988
Lolo Pass820191992
Blacks Creek819821973

Chipping Sparrow Population Trend in Other States

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

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