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

Mountain Bluebird Population Trend in Idaho

All statesForest birds

Mountain Bluebird in Idaho has edged down: down 14% on the route-weighted index since 1971.

-14%Since 1971TrendPercent 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 →
49Routes 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 →
56YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Mountain Bluebird 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 Mountain Bluebird in Idaho. See the full index history below.

Mountain Bluebird Population Forecast in Idaho

If the recent trend holds, Mountain Bluebird in Idaho is projected to rise about 44% by 2030 — from 1.2 in 2025 to a central estimate of 1.8 (95% range 0.66–2.9). A 5-year backtest shows a typical error of ±76.1%, with 80% of held-out values landing inside the 95% band.

+44%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 →
1.8Projected 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 →
0.66–2.995% 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 →
±76.1%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, Mountain Bluebird in Idaho is projected to rise about 44% by 2030 — from 1.2 in 2025 to a central estimate of 1.8 (95% range 0.66–2.9). A 5-year backtest shows a typical error of ±76.1%, with 80% of held-out values landing inside the 95% band.19682030
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 →
20261.70.622.8
20271.70.632.8
20281.70.642.8
20291.80.652.9
20301.80.662.9

Mountain Bluebird Survey Routes in Idaho

Routes recording Mountain Bluebird 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 →
Sawtooth Cty1120141989
Dougal Res920251988
Cape Horn720251972
Sawtooth City 2720252015
Mud Lake720041988
Henry619831973
Leadore520241976
Featherville520161989
Baker420241982
Squirrel420251971
Triangle420251985
Naples320001975
Lolo Pass320101993
Centerville320191972
Alturas319871968
Iron Springs320241988
Almo320251988
Mivoden220251994
Challis220241977
Coolin220251987
Baldy Mountain220162013
Yellow Pine219981990
Silver City220252012
Picabo220172017
Daniels Res220251988

Mountain Bluebird Population Trend in Other States

alaskaarizonacaliforniacoloradomontananebraskanevadanew-mexiconorth-dakotaoregonsouth-dakotautahwashingtonwyoming

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