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

Great Horned Owl Population Trend in Nevada

All statesBirds of prey

Great Horned Owl in Nevada has increased: up 31% on the route-weighted index since 1974.

+31%Since 1974TrendPercent 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 →
20Routes 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 →
34YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Great Horned Owl 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 Great Horned Owl in Nevada. See the full index history below.

Great Horned Owl Population Forecast in Nevada

If the recent trend holds, Great Horned Owl in Nevada is projected to stay roughly flat through 2030, near 0.10 (95% range 0.00–0.41). A 5-year backtest shows a typical error of ±60.4%, with 100% of held-out values landing inside the 95% band.

n/aChange 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 →
0.10Projected 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 →
0.00–0.4195% 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 →
±60.4%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, Great Horned Owl in Nevada is projected to stay roughly flat through 2030, near 0.10 (95% range 0.00–0.41). A 5-year backtest shows a typical error of ±60.4%, with 100% of held-out values landing inside the 95% band.19692030
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 →
20260.110.000.42
20270.100.000.42
20280.100.000.42
20290.100.000.42
20300.100.000.41

Great Horned Owl Survey Routes in Nevada

Routes recording Great Horned Owl 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 →
Ruby Valley 2220212009
Nelson220242006
Gardnerville 2220152015
Piute Mdws120212021
Midas119991999
Ranchogrande119961992
Sand Pass119941994
Humboldt Nf120152015
Cortez120162016
Walker Can120241969
Mizpah120242024
Ash Meadows120252025
Meadow Vally119961996
Majors Place119991996
Gardnerville120021995
Dobbin Creek119781978
Jarbidge120062006
Bald Mtn.120011992
Chimney Res.120242013
Fallon120221993

Great Horned Owl Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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