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

White-crowned Sparrow Population Trend in Nevada

All statesGeneralists

White-crowned Sparrow in Nevada has declined: down 43% on the route-weighted index since 1973.

-43%Since 1973TrendPercent 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 →
16Routes 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 →
28YearsYears 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 NevadaNotable 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 Nevada. See the full index history below.

White-crowned Sparrow Population Forecast in Nevada

If the recent trend holds, White-crowned Sparrow in Nevada is projected to stay roughly flat through 2029, near 0.21 (95% range 0.00–0.69). A 5-year backtest shows a typical error of ±306.2%, with 100% of held-out values landing inside the 95% band.

n/aChange 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 →
0.21Projected 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 →
0.00–0.6995% 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 →
±306.2%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, White-crowned Sparrow in Nevada is projected to stay roughly flat through 2029, near 0.21 (95% range 0.00–0.69). A 5-year backtest shows a typical error of ±306.2%, with 100% of held-out values landing inside the 95% band.19702029
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 →
20250.210.000.69
20260.210.000.69
20270.210.000.69
20280.210.000.69
20290.210.000.69

White-crowned Sparrow Survey Routes in Nevada

Routes recording White-crowned Sparrow in Nevada.
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 →
Nelson1220031997
Dinner Sta619931970
Calico Spr319731973
Ruby Valley320012001
Dobbin Creek319961996
Jarbidge220151997
Hawthorne220011997
Ranchogrande120151995
Bald Mtn.120001993
Fish Creek120062004
Comins Lake120112008
Walker Can119771977
Humboldt Nf119941994
Humboldt Nf 2120242024
Eureka119721972
Majors Place119911991

White-crowned Sparrow Population Trend in Other States

alaskacaliforniacoloradoidahomontananew-mexicooregonutahwashingtonwyoming

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