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

Hairy Woodpecker Population Trend in Idaho

All statesForest birds

Hairy Woodpecker in Idaho has declined: down 47% on the route-weighted index since 1973.

-47%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 →
46Routes 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 →
51YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Hairy Woodpecker Trends in IdahoNotable 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 Hairy Woodpecker in Idaho. See the full index history below.

Hairy Woodpecker Population Forecast in Idaho

If the recent trend holds, Hairy Woodpecker in Idaho is projected to fall about 52% by 2029 — from 0.44 in 2024 to a central estimate of 0.21 (95% range 0.00–0.57). A 5-year backtest shows a typical error of ±49.5%, with 100% of held-out values landing inside the 95% band.

-52%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 →
0.21Projected 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 →
0.00–0.5795% 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 →
±49.5%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, Hairy Woodpecker in Idaho is projected to fall about 52% by 2029 — from 0.44 in 2024 to a central estimate of 0.21 (95% range 0.00–0.57). A 5-year backtest shows a typical error of ±49.5%, 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 →
20250.220.000.59
20260.220.000.58
20270.220.000.58
20280.210.000.58
20290.210.000.57

Hairy Woodpecker Survey Routes in Idaho

Routes recording Hairy Woodpecker in Idaho.
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 →
Coolin520241986
Challis320241981
Avery220231979
Grangeville220231987
Cascade219841974
Squirrel220181972
Sawtooth City 2220232019
Silver City220022002
Nezperce Nf219991996
Cabarton220211986
Blackft Res119981988
Naples120241973
Mivoden120181978
Gifford119901990
Nezperce120081985
Lolo Pass120151993
Golden120061993
Baker120151986
Cape Horn120231972
Leadore119741974
N Fork Cda R120181994
Rochat Divde120231993
Centerville120091973
Alturas119861968
Craters119861986

Hairy Woodpecker Population Trend in Other States

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

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