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

Pygmy Nuthatch Population Trend in Washington

All statesForest birds

Pygmy Nuthatch in Washington has increased: up 45% on the route-weighted index since 1970.

+45%Since 1970TrendPercent 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 →
26Routes 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 →
54YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Pygmy Nuthatch Trends in WashingtonNotable 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 Pygmy Nuthatch in Washington. See the full index history below.

Pygmy Nuthatch Population Forecast in Washington

If the recent trend holds, Pygmy Nuthatch in Washington is projected to rise about 359% by 2029 — from 0.16 in 2024 to a central estimate of 0.72 (95% range 0.00–1.5). A 5-year backtest shows a typical error of ±138%, with 100% of held-out values landing inside the 95% band.

+359%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 →
0.72Projected 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 →
0.00–1.595% 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 →
±138%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, Pygmy Nuthatch in Washington is projected to rise about 359% by 2029 — from 0.16 in 2024 to a central estimate of 0.72 (95% range 0.00–1.5). A 5-year backtest shows a typical error of ±138%, with 100% of held-out values landing inside the 95% band.19682029
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 →
20250.690.001.4
20260.700.001.5
20270.710.001.5
20280.720.001.5
20290.720.001.5

Pygmy Nuthatch Survey Routes in Washington

Routes recording Pygmy Nuthatch in Washington.
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 →
Deer Park720151994
Mt. Adams719931993
Turnbull Nwr620231993
Spring Lake619901990
L. Wenatchee620231996
L Pend O Nwr420231995
Reardan420241969
Rimrock419731969
Snowden419711971
Malden420232001
Keller220061968
Asotin220221998
Winthrop219881984
Tonasket220052005
Ewan220072004
Ellensburg220191999
Lake Chelan220241999
Chewelah120191977
Ewan 2120242023
Twin Lakes120032003
Cusick120212015
Ronald120241973
Leavenworth120231994
Wilbur120171991
Omak Creek120241996

Pygmy Nuthatch Population Trend in Other States

arizonacaliforniacoloradoidahomontananebraskanew-mexicooregonsouth-dakotautahwyoming

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