BirdAnalyst
Species · Wyoming · BBS 2025 Release · 1966–2024

White-crowned Sparrow Population Trend in Wyoming

All statesGeneralists

White-crowned Sparrow in Wyoming has increased: up 27% on the route-weighted index since 1970.

+27%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 →
55Routes 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 →
55YearsYears 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 →

No notable trend signals for White-crowned Sparrow in Wyoming. See the full index history below.

White-crowned Sparrow Population Forecast in Wyoming

If the recent trend holds, White-crowned Sparrow in Wyoming is projected to rise about 51% by 2029 — from 2.0 in 2024 to a central estimate of 3.1 (95% range 1.3–4.9). A 5-year backtest shows a typical error of ±28.4%, with 100% of held-out values landing inside the 95% band.

+51%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 →
3.1Projected 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 →
1.3–4.995% 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 →
±28.4%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, White-crowned Sparrow in Wyoming is projected to rise about 51% by 2029 — from 2.0 in 2024 to a central estimate of 3.1 (95% range 1.3–4.9). A 5-year backtest shows a typical error of ±28.4%, 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 →
20253.01.24.7
20263.01.24.8
20273.01.24.8
20283.01.34.8
20293.11.34.9

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 →
Yellowstone4720221987
Buckskin Mtn4520211980
Soda Lake3220241980
Big Sandy2620241994
Ryan Park2620231993
Hayden Val2419861985
Bald Mtn2220241990
Colter Bay 21820242019
Fox Park1420241992
Ne Entrance1220211982
Moose1220241976
Hunter Peak1120241988
Mammoth920241982
Moran820162002
Savery719951989
Horse Creek720241980
Colter Bay519991968
Riverside520241994
Crazy Woman520241979
Daniel519851981
Fiddler Lk520241979
Savery 2520242007
Meeteetse420181993
Wilson420241979
Anchor420082004

White-crowned Sparrow Population Trend in Other States

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