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

Clark's Nutcracker Population Trend in Idaho

All statesGeneralists

Clark's Nutcracker in Idaho has declined: down 38% on the route-weighted index since 1974.

-38%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 →
30Routes 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 Clark's Nutcracker 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 Clark's Nutcracker in Idaho. See the full index history below.

Clark's Nutcracker Population Forecast in Idaho

If the recent trend holds, Clark's Nutcracker in Idaho is projected to rise about 51% by 2029 — from 0.20 in 2024 to a central estimate of 0.30 (95% range 0.00–0.83). A 5-year backtest shows a typical error of ±82.5%, with 100% of held-out values landing inside the 95% band.

+51%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 →
0.30Projected 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 →
0.00–0.8395% 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 →
±82.5%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, Clark's Nutcracker in Idaho is projected to rise about 51% by 2029 — from 0.20 in 2024 to a central estimate of 0.30 (95% range 0.00–0.83). A 5-year backtest shows a typical error of ±82.5%, 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 →
20250.320.000.84
20260.320.000.84
20270.310.000.83
20280.310.000.83
20290.300.000.83

Clark's Nutcracker Survey Routes in Idaho

Routes recording Clark's Nutcracker 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 →
Featherville1620101989
Naples1220091980
Kyle Canyon819871987
Lolo Pass519981993
Squirrel420131984
Rochat Divde320041994
Almo320181989
Avery219931984
Cascade219811981
Centerville220161973
Sawtooth City 2220242015
Cobalt220151989
Sunbeam220171994
Bates219981998
Nezperce Nf219921992
Sawtooth Cty220141988
Mivoden120111983
Grangeville119951989
Baker120072004
Cape Horn120241987
Challis120241979
Leadore120241974
Alturas119871968
Magic Mtn120182002
Coolin120112011

Clark's Nutcracker Population Trend in Other States

arizonacaliforniacoloradomontananevadanew-mexicooregonsouth-dakotautahwashingtonwyoming

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