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Species · Nevada · BBS 2025 Release · 1966–2024

Costa's Hummingbird Population Trend in Nevada

All statesGeneralists

Costa's Hummingbird in Nevada has increased: up 39% on the route-weighted index since 1994.

+39%Since 1994TrendPercent 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 →
20YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Costa's Hummingbird 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 Costa's Hummingbird in Nevada. See the full index history below.

Costa's Hummingbird Population Forecast in Nevada

If the recent trend holds, Costa's Hummingbird in Nevada is projected to fall about 49% by 2029 — from 0.25 in 2024 to a central estimate of 0.13 (95% range 0.00–0.29). A 5-year backtest shows a typical error of ±54.7%, with 60% of held-out values landing inside the 95% band.

-49%Change 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 →
0.13Projected 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 →
0.00–0.2995% 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 →
±54.7%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, Costa's Hummingbird in Nevada is projected to fall about 49% by 2029 — from 0.25 in 2024 to a central estimate of 0.13 (95% range 0.00–0.29). A 5-year backtest shows a typical error of ±54.7%, with 60% of held-out values landing inside the 95% band.19692029
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 →
20250.130.000.29
20260.130.000.29
20270.130.000.29
20280.130.000.29
20290.130.000.29

Costa's Hummingbird Survey Routes in Nevada

Routes recording Costa's Hummingbird 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 →
Nelson420241995
Beatty320242010
Alamo219691969
Ash Meadows119951993

Costa's Hummingbird Population Trend in Other States

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