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

Fox Sparrow Population Trend in Nevada

All statesGeneralists

Fox Sparrow in Nevada has held roughly steady: down 4% on the route-weighted index since 1995.

-4%Since 1995TrendPercent 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 →
11Routes 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 →
25YearsYears 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 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 Fox Sparrow in Nevada. See the full index history below.

Fox Sparrow Population Forecast in Nevada

If the recent trend holds, Fox Sparrow in Nevada is projected to stay roughly flat through 2029, near 0.06 (95% range 0.00–0.52). A 5-year backtest shows a typical error of ±181.4%, 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 →
0.06Projected 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 →
0.00–0.5295% 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 →
±181.4%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 Nevada is projected to stay roughly flat through 2029, near 0.06 (95% range 0.00–0.52). A 5-year backtest shows a typical error of ±181.4%, with 100% of held-out values landing inside the 95% band.19932029
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 →
20250.100.000.55
20260.090.000.55
20270.080.000.54
20280.070.000.53
20290.060.000.52

Fox Sparrow Survey Routes in Nevada

Routes recording Fox 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 →
Hawthorne1220011997
Ruby Valley720011999
Austin620182016
Humboldt Nf420191993
Chimney Res.220152014
Jarbidge120141997
Comins Lake120062006
Fish Creek120192008
Charleston Reservoir120242024
Toiyabe Nf120172017
Willis120091995

Fox Sparrow Population Trend in Other States

alaskacaliforniacoloradoidahomainemontanaoregonutahwashingtonwyoming

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