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Species · Wyoming · BBS 2025 Release · 1966–2024

Greater Sage-Grouse Population Trend in Wyoming

All statesGeneralists

Greater Sage-Grouse in Wyoming has collapsed: down 80% on the route-weighted index since 1970.

-80%Since 1970TrendPercent 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 →
81Routes 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 →
56YearsYears 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 WyomingNotable 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 declinecomputed 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 →

Greater Sage-Grouse has collapsed in Wyoming: down 79% on the route-weighted index since 1970.

Greater Sage-Grouse Population Forecast in Wyoming

If the recent trend holds, Greater Sage-Grouse in Wyoming is projected to fall about 91% by 2029 — from 1.3 in 2024 to a central estimate of 0.12 (95% range 0.00–2.3). A 5-year backtest shows a typical error of ±57.6%, with 100% of held-out values landing inside the 95% band.

-91%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 →
0.12Projected 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 →
0.00–2.395% 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 →
±57.6%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 Wyoming is projected to fall about 91% by 2029 — from 1.3 in 2024 to a central estimate of 0.12 (95% range 0.00–2.3). A 5-year backtest shows a typical error of ±57.6%, with 100% of held-out values landing inside the 95% band.19682029
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 →
20250.280.002.5
20260.240.002.4
20270.200.002.4
20280.160.002.3
20290.120.002.3

Greater Sage-Grouse Survey Routes in Wyoming

Routes recording Greater Sage-Grouse in Wyoming.
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 →
Boulder4320121982
Bear Creek2820241968
Big Sandy2020181988
Elk Horn1720181988
Frannie1720232006
Arminto1420241983
Mayoworth1420062000
Seedskadee1420151996
Bairoil1320241988
Ryegrass1220241994
Patrick Draw 61120242010
Diamondville1119811978
Shirley920061980
Patrick Draw 2919811981
Arvada820001993
Reliance819811981
Glenrock719741974
Patrick Draw 5720092005
Nowood620241990
Riverside619711970
Sand Draw620242010
Welch619941980
Rozet620172017
Meeteetse520192014
Sussex520162006

Greater Sage-Grouse Population Trend in Other States

californiacoloradoidahomontananevadanorth-dakotaoregonsouth-dakotautah

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