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Species · Idaho · BBS 2025 Release · 1966–2024

American Robin Population Trend in Idaho

All statesForest birds

American Robin in Idaho has declined: down 30% on the route-weighted index since 1970.

-30%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 →
65Routes 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 American Robin 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 →

No notable trend signals for American Robin in Idaho. See the full index history below.

American Robin Population Forecast in Idaho

If the recent trend holds, American Robin in Idaho is projected to stay roughly flat through 2029, near 21 (95% range 11–31). A 5-year backtest shows a typical error of ±18.2%, with 100% of held-out values landing inside the 95% band.

-8%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 →
21Projected 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 →
11–3195% 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 →
±18.2%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, American Robin in Idaho is projected to stay roughly flat through 2029, near 21 (95% range 11–31). A 5-year backtest shows a typical error of ±18.2%, 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 →
2025221232
2026221232
2027221231
2028211131
2029211131

American Robin Survey Routes in Idaho

Routes recording American Robin 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 →
Cascade8019841968
Henry7919831973
Bates7620231988
Coolin7320241986
Nezperce7120121968
Pocatello6420191979
Magic Mtn6120241987
Naples5420241972
Cabarton5320231985
Golden4320161987
Cape Horn4320241972
Alturas4319871968
Featherville4220241989
Centerville4120191972
Yellow Pine4120161989
Gifford4020171971
Joel4020241989
Cedar Hill3920241989
Burgdorf3820161988
Challis3520241975
N Fork Cda R3520191993
Dougal Res3520241988
Nezperce Nf3419991992
Mud Lake3320231988
Lolo Pass3220191992

American Robin 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.