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

Bobolink Population Trend in Idaho

All statesGrassland birds

Bobolink in Idaho has held roughly steady: up 2% on the route-weighted index since 1978.

+2%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 →
14Routes 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 →
46YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Bobolink 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 Bobolink in Idaho. See the full index history below.

Bobolink Population Forecast in Idaho

If the recent trend holds, Bobolink in Idaho is projected to fall about 62% by 2029 — from 0.32 in 2024 to a central estimate of 0.12 (95% range 0.00–0.41). A 5-year backtest shows a typical error of ±51.4%, with 80% of held-out values landing inside the 95% band.

-62%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 →
0.12Projected 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 →
0.00–0.4195% 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 →
±51.4%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, Bobolink in Idaho is projected to fall about 62% by 2029 — from 0.32 in 2024 to a central estimate of 0.12 (95% range 0.00–0.41). A 5-year backtest shows a typical error of ±51.4%, with 80% of held-out values landing inside the 95% band.19762029
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 →
20250.130.000.42
20260.130.000.42
20270.130.000.41
20280.120.000.41
20290.120.000.41

Bobolink Survey Routes in Idaho

Routes recording Bobolink 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 →
Coolin420241986
Naples320241976
Almo320001995
Cabarton320231990
Bates320181989
Springfield220041984
Pocatello219961980
Cedar Hill120191993
Baker120241978
Leadore119811977
Centerville120142014
Crane Creek120032003
Craters119891989
Dougal Res119931992

Bobolink Population Trend in Other States

californiacoloradoconnecticutillinoisindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooregonpennsylvaniarhode-islandsouth-dakotautahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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