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

Fox Sparrow Population Trend in Wyoming

All statesForest birds

Fox Sparrow in Wyoming has edged down: down 19% on the route-weighted index since 1970.

-19%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 →
23Routes 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 →
49YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Fox Sparrow 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 →

No notable trend signals for Fox Sparrow in Wyoming. See the full index history below.

Fox Sparrow Population Forecast in Wyoming

If the recent trend holds, Fox Sparrow in Wyoming is projected to fall about 57% by 2030 — from 0.62 in 2025 to a central estimate of 0.26 (95% range 0.00–0.64). A 5-year backtest shows a typical error of ±73.4%, with 40% of held-out values landing inside the 95% band.

-57%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 →
0.26Projected 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 →
0.00–0.6495% 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 →
±73.4%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, Fox Sparrow in Wyoming is projected to fall about 57% by 2030 — from 0.62 in 2025 to a central estimate of 0.26 (95% range 0.00–0.64). A 5-year backtest shows a typical error of ±73.4%, with 40% 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 →
20260.260.000.63
20270.260.000.63
20280.260.000.63
20290.260.000.63
20300.260.000.64

Fox Sparrow Survey Routes in Wyoming

Routes recording Fox Sparrow 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 →
Buckskin Mtn1820252015
Alpine1420251989
Soda Lake820252023
Colter Bay519991968
Wilson520251979
Otto419871970
Fox Park420251993
Big Sandy320252008
Ne Entrance219911991
Colter Bay 2220252021
Boulder220072007
Moran220162002
Mtn View219901980
Dubois119741974
Fontenelle120252011
Mammoth120252025
Hunter Peak120252025
Moose120231979
Horse Creek120241989
Diamondville119781978
Green River119821982
Ryan Park120252025
Sybille Cyn119801980

Fox Sparrow Population Trend in Other States

alaskacaliforniacoloradoidahomainemontananevadaoregonutahwashington

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