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Species · Idaho · BBS 2026 Release · 1966–2025

Spotted Towhee Population Trend in Idaho

All statesForest birds

Spotted Towhee in Idaho has surged: up 170% on the route-weighted index since 1971.

+170%Since 1971TrendPercent 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 →
46Routes 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 →
54YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Spotted Towhee 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 →

Spotted Towhee has surged in Idaho: up 170% on the route-weighted index since 1971.

Spotted Towhee Population Forecast in Idaho

If the recent trend holds, Spotted Towhee in Idaho is projected to fall about 29% by 2030 — from 3.1 in 2025 to a central estimate of 2.2 (95% range 0.87–3.6). A 5-year backtest shows a typical error of ±17.4%, with 100% of held-out values landing inside the 95% band.

-29%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 →
2.2Projected 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 →
0.87–3.695% 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 →
±17.4%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, Spotted Towhee in Idaho is projected to fall about 29% by 2030 — from 3.1 in 2025 to a central estimate of 2.2 (95% range 0.87–3.6). A 5-year backtest shows a typical error of ±17.4%, 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 →
20262.10.783.5
20272.20.803.5
20282.20.823.6
20292.20.853.6
20302.20.873.6

Spotted Towhee Survey Routes in Idaho

Routes recording Spotted Towhee 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 →
Centerville2220251972
Featherville1920251989
Almo1520251988
Salmon River1320251988
Gifford1120171971
Magic Mtn1120251987
Joel1120241989
Coolin1020251986
Naples720251975
Avery420251980
Nezperce420121968
Leadore320151995
Pocatello320191990
Picabo320251991
N Fork Cda R220011995
Craters220171986
Marble Creek220251991
Cobalt220251999
Crane Creek220191989
Silver City220231989
Daniels Res220191989
Blackft Res120121985
Mivoden120241990
Lolo Pass120151993
Grangeville119951987

Spotted Towhee Population Trend in Other States

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