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

Gray Partridge Population Trend in Idaho

All statesGame birds

Gray Partridge in Idaho has held roughly steady: down 6% on the route-weighted index since 1978.

-6%Since 1978TrendPercent 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 →
27Routes 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 →
39YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Gray Partridge 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 Gray Partridge in Idaho. See the full index history below.

Gray Partridge Population Forecast in Idaho

If the recent trend holds, Gray Partridge in Idaho is projected to fall about 53% by 2030 — from 0.31 in 2025 to a central estimate of 0.15 (95% range 0.00–0.31). A 5-year backtest shows a typical error of ±120.1%, with 80% of held-out values landing inside the 95% band.

-53%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 →
0.15Projected 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 →
0.00–0.3195% 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 →
±120.1%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, Gray Partridge in Idaho is projected to fall about 53% by 2030 — from 0.31 in 2025 to a central estimate of 0.15 (95% range 0.00–0.31). A 5-year backtest shows a typical error of ±120.1%, with 80% of held-out values landing inside the 95% band.19732030
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 →
20260.140.000.31
20270.140.000.31
20280.140.000.31
20290.150.000.31
20300.150.000.31

Gray Partridge Survey Routes in Idaho

Routes recording Gray Partridge 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 →
Dubois1020251988
Picabo820142014
Gifford320101973
Lost River320001999
Baker320191978
Pasadena Val320121987
Blackft Res220162016
Leadore220182011
Blacks Creek219771977
Ririe220111998
Pocatello220112003
Crane Creek220101993
Iron Springs220242024
Dougal Res220192019
Daniels Res220071988
Preston219881988
Twin Buttes120001986
Kyle Canyon119871987
Tractor Flat119991987
Springfield120032003
Acequia119911990
Henry119811981
Joel120241989
Carey120152002
Mud Lake120251990

Gray Partridge Population Trend in Other States

illinoisindianaiowaminnesotamontananebraskanevadanew-yorknorth-dakotaoregonsouth-dakotautahwashingtonwisconsinwyoming

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