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Species · Oregon · BBS 2026 Release · 1966–2025

Greater Sage-Grouse Population Trend in Oregon

All statesGame birds

Greater Sage-Grouse in Oregon has edged down: down 11% on the route-weighted index since 1975.

-11%Since 1975TrendPercent 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 →
14Routes 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 →
31YearsYears 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 OregonNotable 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 Oregon. See the full index history below.

Greater Sage-Grouse Population Forecast in Oregon

If the recent trend holds, Greater Sage-Grouse in Oregon is projected to fall about 50% by 2030 — from 0.28 in 2025 to a central estimate of 0.14 (95% range 0.00–0.42). A 5-year backtest shows a typical error of ±214.6%, with 100% of held-out values landing inside the 95% band.

-50%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 →
0.14Projected 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 →
0.00–0.4295% 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 →
±214.6%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 Oregon is projected to fall about 50% by 2030 — from 0.28 in 2025 to a central estimate of 0.14 (95% range 0.00–0.42). A 5-year backtest shows a typical error of ±214.6%, with 100% of held-out values landing inside the 95% band.19712030
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 →
20260.140.000.42
20270.140.000.42
20280.140.000.42
20290.140.000.42
20300.140.000.42

Greater Sage-Grouse Survey Routes in Oregon

Routes recording Greater Sage-Grouse in Oregon.
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 →
Three Forks2520252012
Blitzen1619921979
Battle Mtn619991990
Flook Lake320251999
Crowley320071988
Lookout Lake219941994
Blitzen 2120012001
Crane120052005
Sheaville120152015
Eightmile119861986
Buchanan119901971
Fish Lake120011972
Adrian120172017
Blizzard Gap119901990

Greater Sage-Grouse Population Trend in Other States

californiacoloradoidahomontananevadanorth-dakotasouth-dakotautahwyoming

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