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

Greater Sage-Grouse Population Trend in Idaho

All statesGeneralists

Greater Sage-Grouse in Idaho has declined: down 43% on the route-weighted index since 1974.

-43%Since 1974TrendPercent 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 →
22Routes 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 →
41YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Greater Sage-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 Greater Sage-Grouse in Idaho. See the full index history below.

Greater Sage-Grouse Population Forecast in Idaho

If the recent trend holds, Greater Sage-Grouse in Idaho is projected to fall about 100% by 2029 — from 0.40 in 2024 to a central estimate of 0.00 (95% range 0.00–0.84). A 5-year backtest shows a typical error of ±155.1%, with 100% of held-out values landing inside the 95% band.

-100%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 →
0.00Projected 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 →
0.00–0.8495% 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 →
±155.1%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, Greater Sage-Grouse in Idaho is projected to fall about 100% by 2029 — from 0.40 in 2024 to a central estimate of 0.00 (95% range 0.00–0.84). A 5-year backtest shows a typical error of ±155.1%, with 100% of held-out values landing inside the 95% band.19702029
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 →
20250.020.000.86
20260.010.000.85
20270.000.000.84
20280.000.000.84
20290.000.000.84

Greater Sage-Grouse Survey Routes in Idaho

Routes recording Greater Sage-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 →
Circular Bu820241986
Picabo719881988
Kyle Canyon620031985
Craters620121979
Mud Lake620011990
Tractor Flat520191986
Carey520161990
Cascade219741974
Dubois220241970
Triangle220141988
Hot Spring220071988
Almo220112011
Twin Buttes120071990
Lost River120151987
Baker119931979
Leadore119881988
Blacks Creek119821974
Springfield119801980
Crane Creek120081991
Iron Springs120191990
Featherville120072007
Dougal Res120132007

Greater Sage-Grouse Population Trend in Other States

californiacoloradomontananevadanorth-dakotaoregonsouth-dakotautahwyoming

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