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

Townsend's Solitaire Population Trend in Idaho

All statesForest birds

Townsend's Solitaire in Idaho has declined: down 35% on the route-weighted index since 1976.

-35%Since 1976TrendPercent 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 →
35Routes 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 →
50YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Townsend's Solitaire 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 Townsend's Solitaire in Idaho. See the full index history below.

Townsend's Solitaire Population Forecast in Idaho

If the recent trend holds, Townsend's Solitaire in Idaho is projected to rise about 94% by 2030 — from 0.20 in 2025 to a central estimate of 0.39 (95% range 0.07–0.70). A 5-year backtest shows a typical error of ±100.2%, with 100% of held-out values landing inside the 95% band.

+94%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 →
0.39Projected 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 →
0.07–0.7095% 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 →
±100.2%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, Townsend's Solitaire in Idaho is projected to rise about 94% by 2030 — from 0.20 in 2025 to a central estimate of 0.39 (95% range 0.07–0.70). A 5-year backtest shows a typical error of ±100.2%, 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 →
20260.380.060.69
20270.380.070.69
20280.380.070.69
20290.380.070.69
20300.390.070.70

Townsend's Solitaire Survey Routes in Idaho

Routes recording Townsend's Solitaire 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 →
Challis620111977
Lolo Pass520191992
Cascade419761976
Squirrel420091974
Cobalt420121992
Cape Horn320061986
Grangeville220211990
Golden220161989
Centerville220251982
Alturas219681968
Burgdorf220161996
Sawtooth Cty220061989
Naples119881979
Mivoden120251979
Avery120191980
Twin Buttes119991999
Deep Creek119851985
Baker120121977
Leadore120141977
N Fork Cda R120031995
Rochat Divde120251993
Springfield119811976
Triangle120102010
Magic Mtn120221997
Coolin120251986

Townsend's Solitaire Population Trend in Other States

alaskaarizonacaliforniacoloradomontananebraskanevadanew-mexicooregonsouth-dakotautahwashingtonwyoming

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