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

House Sparrow Population Trend in Idaho

All statesGeneralists

House Sparrow in Idaho has fallen sharply: down 74% on the route-weighted index since 1970.

-74%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 →
40Routes 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 House 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 declinecomputed 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 →

House Sparrow has fallen sharply in Idaho: down 74% on the route-weighted index since 1970.

House Sparrow Population Forecast in Idaho

If the recent trend holds, House Sparrow in Idaho is projected to fall about 100% by 2029 — from 12 in 2024 to a central estimate of 0.00 (95% range 0.00–34). A 5-year backtest shows a typical error of ±108.4%, with 100% of held-out values landing inside the 95% band.

-100%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 →
0.00Projected 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 →
0.00–3495% 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 →
±108.4%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, House Sparrow in Idaho is projected to fall about 100% by 2029 — from 12 in 2024 to a central estimate of 0.00 (95% range 0.00–34). A 5-year backtest shows a typical error of ±108.4%, with 100% 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 →
20253.20.0038
20262.40.0037
20271.50.0036
20280.640.0035
20290.000.0034

House Sparrow Survey Routes in Idaho

Routes recording House 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 →
Pocatello21620191979
Blacks Creek20020171968
Picabo18520211988
Mud Lake16720231988
Cedar Hill16220241989
Preston9720231988
Glenns Ferry8819861968
Ririe6920231971
Acequia5920121979
Mora3720242018
Triangle3520241986
Baker3420241974
Alturas3419681968
Henry2219831973
Silver City1519891989
Pasadena Val1220161987
Sunbeam1019941994
Bates820231988
Springfield720181969
Blackft Res520181984
Gifford520171971
Tractor Flat520241997
Leadore520241976
Iron Springs520241988
Naples419901972

House 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 2026-05-22.