BirdAnalyst
Species · Nevada · BBS 2026 Release · 1966–2025

Savannah Sparrow Population Trend in Nevada

All statesGrassland birds

Savannah Sparrow in Nevada has surged: up 75% on the route-weighted index since 1973.

+75%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 →
30Routes 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 →
45YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Savannah 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 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 →

Savannah Sparrow has surged in Nevada: up 75% on the route-weighted index since 1973.

Savannah Sparrow Population Forecast in Nevada

If the recent trend holds, Savannah Sparrow in Nevada is projected to rise about 23% by 2030 — from 0.33 in 2025 to a central estimate of 0.41 (95% range 0.00–1.9). A 5-year backtest shows a typical error of ±219.9%, with 100% of held-out values landing inside the 95% band.

+23%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 →
0.41Projected 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 →
0.00–1.995% 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 →
±219.9%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, Savannah Sparrow in Nevada is projected to rise about 23% by 2030 — from 0.33 in 2025 to a central estimate of 0.41 (95% range 0.00–1.9). A 5-year backtest shows a typical error of ±219.9%, 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 →
20260.460.002.0
20270.450.002.0
20280.430.002.0
20290.420.002.0
20300.410.001.9

Savannah Sparrow Survey Routes in Nevada

Routes recording Savannah 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 →
Dinner Sta819931990
Comins Lake720142011
Ruby Valley719991999
Nixon420191989
Gardnerville320121998
Humboldt Nf 2320252021
Midas220241998
Humboldt Nf220192013
Mizpah220172017
Ash Meadows220021993
Eureka220172008
Mill City220232023
Bald Mtn.220251992
Chimney Res.220232017
Fallon220171998
Ranchogrande120231990
Sand Pass120241979
Sheldon Nwr120102010
Walker Can120071986
Austin120162016
Toiyabe Nf120102002
Ruby Valley 2120182016
Majors Place120242024
Virgin Creek120061995
Meadow Vally120252021

Savannah Sparrow Population Trend in Other States

alaskaarizonacaliforniacoloradoconnecticutdelawareidahoillinoisindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamissourimontananebraskanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooregonpennsylvaniarhode-islandsouth-dakotatennesseeutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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