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Species · Wyoming · BBS 2026 Release · 1966–2025

White-crowned Sparrow Population Trend in Wyoming

All statesForest birds

White-crowned Sparrow in Wyoming has risen sharply: up 52% on the route-weighted index since 1970.

+52%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 →
59Routes 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 White-crowned 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 →

long arc increasecomputed 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 →

White-crowned Sparrow has risen sharply in Wyoming: up 52% on the route-weighted index since 1970.

White-crowned Sparrow Population Forecast in Wyoming

If the recent trend holds, White-crowned Sparrow in Wyoming is projected to stay roughly flat through 2030, near 3.3 (95% range 1.5–5.0). A 5-year backtest shows a typical error of ±20%, with 100% of held-out values landing inside the 95% band.

-2%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 →
3.3Projected 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 →
1.5–5.095% 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 →
±20%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, White-crowned Sparrow in Wyoming is projected to stay roughly flat through 2030, near 3.3 (95% range 1.5–5.0). A 5-year backtest shows a typical error of ±20%, 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 →
20263.11.44.9
20273.21.44.9
20283.21.55.0
20293.21.55.0
20303.31.55.0

White-crowned Sparrow Survey Routes in Wyoming

Routes recording White-crowned 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 Mtn5620251980
Ryan Park5020251993
Yellowstone3520251987
Soda Lake2620251980
Big Sandy2620241994
Hayden Val2419861985
Mammoth2420251982
Bald Mtn2220251990
Fox Park1820251992
Ne Entrance1320251982
Hunter Peak1220251988
Colter Bay 21220252019
Moose920251976
Wilson820251979
Moran820162002
Savery719951989
Savery 2620252007
Colter Bay519991968
Crazy Woman520241979
Horse Creek520251980
Daniel519851981
Riverside420251994
Meeteetse420181993
Alpine420251979
Anchor420082004

White-crowned Sparrow Population Trend in Other States

alaskacaliforniacoloradoidahomontananevadanew-mexicooregonutahwashington

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