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Species · Wyoming · BBS 2026 Release · 1966–2025

Greater Sage-Grouse Population Trend in Wyoming

All statesGame birds

Greater Sage-Grouse in Wyoming has fallen sharply: down 72% on the route-weighted index since 1970.

-72%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 →
57YearsYears 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 fallen sharply in Wyoming: down 72% 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 87% by 2030 — from 1.1 in 2025 to a central estimate of 0.14 (95% range 0.00–2.3). A 5-year backtest shows a typical error of ±59.7%, with 100% of held-out values landing inside the 95% band.

-87%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 →
0.00–2.395% 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 →
±59.7%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 87% by 2030 — from 1.1 in 2025 to a central estimate of 0.14 (95% range 0.00–2.3). A 5-year backtest shows a typical error of ±59.7%, 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 →
20260.290.002.5
20270.260.002.4
20280.220.002.4
20290.180.002.4
20300.140.002.3

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 →
Ervay3620251973
Big Sandy2320251988
Lamont2220251994
Elk Horn1720181988
Frannie1720232006
Mayoworth1420062000
Seedskadee1420151996
Ryegrass1220241994
Diamondville1119811978
Shirley920061980
Patrick Draw 2919811981
Arvada820001993
Reliance819811981
Glenrock719741974
Patrick Draw 5720092005
Nowood620241990
Riverside619711970
Bairoil620251988
Welch619941980
Rozet620172017
Meeteetse520192014
Arminto520251983
Sussex520162006
Raven520241993
Sweetwater520091980

Greater Sage-Grouse Population Trend in Other States

californiacoloradoidahomontananevadanorth-dakotaoregonsouth-dakotautah

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