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

Song Sparrow Population Trend in Idaho

All statesGeneralists

Song Sparrow in Idaho has risen sharply: up 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 →
61Routes 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 Song 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 →

Song Sparrow has risen sharply in Idaho: up 74% on the route-weighted index since 1970.

Song Sparrow Population Forecast in Idaho

If the recent trend holds, Song Sparrow in Idaho is projected to stay roughly flat through 2029, near 7.2 (95% range 3.4–11). A 5-year backtest shows a typical error of ±10.8%, with 100% of held-out values landing inside the 95% band.

+6%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 →
7.2Projected 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 →
3.4–1195% 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 →
±10.8%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, Song Sparrow in Idaho is projected to stay roughly flat through 2029, near 7.2 (95% range 3.4–11). A 5-year backtest shows a typical error of ±10.8%, 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 →
20257.13.311
20267.13.411
20277.13.411
20287.13.411
20297.23.411

Song Sparrow Survey Routes in Idaho

Routes recording Song 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 →
Challis3620241975
Cabarton2720231985
Nezperce2620121968
Centerville2620191972
Rochat Divde2420231993
Gifford2320171971
Pierce2220071990
Featherville2120241989
Naples2020241972
Golden2020161987
Baker1520241974
Magic Mtn1520241987
N Fork Cda R1520191993
Picabo1520211988
Joel1320241989
Sunbeam1320191994
Crane Creek1020191988
Coolin920241986
Cape Horn820241972
Bates820231988
Almo820231988
Avery720231979
Pocatello720191979
Salmon River620211988
Iron Springs520241988

Song Sparrow Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawaregeorgiaillinoisindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseeutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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