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Species · Idaho · BBS 2026 Release · 1966–2025

Sharp-tailed Grouse Population Trend in Idaho

All statesGame birds

Sharp-tailed Grouse in Idaho has edged down: down 11% on the route-weighted index since 1990.

-11%Since 1990TrendPercent 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 →
4Routes 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 →
20YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Sharp-tailed Grouse 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 Sharp-tailed Grouse in Idaho. See the full index history below.

Sharp-tailed Grouse Population Forecast in Idaho

If the recent trend holds, Sharp-tailed Grouse in Idaho is projected to fall about 75% by 2030 — from 0.51 in 2025 to a central estimate of 0.13 (95% range 0.00–0.41). A 5-year backtest shows a typical error of ±301.1%, with 80% of held-out values landing inside the 95% band.

-75%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 →
0.13Projected 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 →
0.00–0.4195% 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 →
±301.1%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, Sharp-tailed Grouse in Idaho is projected to fall about 75% by 2030 — from 0.51 in 2025 to a central estimate of 0.13 (95% range 0.00–0.41). A 5-year backtest shows a typical error of ±301.1%, with 80% of held-out values landing inside the 95% band.19882030
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 →
20260.120.000.41
20270.130.000.41
20280.130.000.41
20290.130.000.41
20300.130.000.41

Sharp-tailed Grouse Survey Routes in Idaho

Routes recording Sharp-tailed Grouse 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 →
Daniels Res1820251988
Blackft Res220012001
Crane Creek120052003
Bates120182016

Sharp-tailed Grouse Population Trend in Other States

alaskacoloradomichiganminnesotamontananebraskanorth-dakotasouth-dakotautahwashingtonwisconsinwyoming

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