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

Black-chinned Sparrow Population Trend in Nevada

All statesGeneralists

Black-chinned Sparrow in Nevada has fallen sharply: down 59% on the route-weighted index since 1998.

-59%Since 1998TrendPercent 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 →
4Routes 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 →
17YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Black-chinned 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 →

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 →

Black-chinned Sparrow has fallen sharply in Nevada: down 59% on the route-weighted index since 1998.

Black-chinned Sparrow Survey Routes in Nevada

Routes recording Black-chinned 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 →
Nelson520101996
Dobbin Creek420142004
Meadow Vally320241996
Willis120031997

Black-chinned Sparrow Population Trend in Other States

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