BirdAnalyst
Species · Wyoming · BBS 2026 Release · 1966–2025

Ruffed Grouse Population Trend in Wyoming

All statesGame birds

Ruffed Grouse in Wyoming has fallen sharply: down 55% on the route-weighted index since 1980.

-55%Since 1980TrendPercent 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 →
18Routes 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 →
32YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Ruffed 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 →

Ruffed Grouse has fallen sharply in Wyoming: down 55% on the route-weighted index since 1980.

Ruffed Grouse Population Forecast in Wyoming

If the recent trend holds, Ruffed Grouse in Wyoming is projected to stay roughly flat through 2030, near 0.04 (95% range 0.00–0.10). A 5-year backtest shows a typical error of ±70.2%, with 100% of held-out values landing inside the 95% band.

n/aChange 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 →
0.04Projected 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 →
0.00–0.1095% 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 →
±70.2%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, Ruffed Grouse in Wyoming is projected to stay roughly flat through 2030, near 0.04 (95% range 0.00–0.10). A 5-year backtest shows a typical error of ±70.2%, with 100% of held-out values landing inside the 95% band.19702030
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 →
20260.040.000.11
20270.040.000.11
20280.040.000.11
20290.040.000.10
20300.040.000.10

Ruffed Grouse Survey Routes in Wyoming

Routes recording Ruffed 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 →
Moskee319801980
West Thumb319821982
Colter Bay219991970
Alpine220211993
Hunter Peak119951995
Ne Entrance120121993
Moose120251978
Yellowstone120182018
Sundance120241998
Bald Mtn120061995
Soda Lake119981992
Fiddler Lk120191980
Moran120152003
Wilson119951995
Horse Creek120251984
Colter Bay 2120242019
Moskee 2120112011
Mammoth120181988

Ruffed Grouse Population Trend in Other States

alaskaarkansascaliforniaconnecticutgeorgiaidahoindianaiowakentuckymainemarylandmassachusettsmichiganminnesotamontananevadanew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiooregonpennsylvaniarhode-islandsouth-dakotatennesseeutahvermontvirginiawashingtonwest-virginiawisconsin

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