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

Olive-sided Flycatcher Population Trend in Idaho

All statesAerial insectivores

Olive-sided Flycatcher in Idaho has surged: up 76% on the route-weighted index since 1972.

+76%Since 1972TrendPercent 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 →
34Routes 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 →
53YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Olive-sided Flycatcher 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 →

long arc increasecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Olive-sided Flycatcher has surged in Idaho: up 76% on the route-weighted index since 1972.

Olive-sided Flycatcher Population Forecast in Idaho

If the recent trend holds, Olive-sided Flycatcher in Idaho is projected to rise about 93% by 2029 — from 0.52 in 2024 to a central estimate of 1.0 (95% range 0.38–1.6). A 5-year backtest shows a typical error of ±66.3%, with 100% of held-out values landing inside the 95% band.

+93%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 →
1.0Projected 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 →
0.38–1.695% 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 →
±66.3%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, Olive-sided Flycatcher in Idaho is projected to rise about 93% by 2029 — from 0.52 in 2024 to a central estimate of 1.0 (95% range 0.38–1.6). A 5-year backtest shows a typical error of ±66.3%, 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 →
20250.980.351.6
20260.980.351.6
20270.990.361.6
20281.000.371.6
20291.00.381.6

Olive-sided Flycatcher Survey Routes in Idaho

Routes recording Olive-sided Flycatcher 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 →
Lolo Pass1320191992
Cape Horn1120241986
Burgdorf720161988
Yellow Pine720161989
Golden520161987
Pierce520071990
Marble Creek420231988
Sawtooth Cty420141990
Baldy Mountain320162013
Cabarton320221985
Mivoden220181977
N Fork Cda R220191994
Cascade219831983
Rochat Divde220231993
Squirrel220231971
Featherville220111989
Nezperce Nf219981992
Naples120091972
Avery120231979
Gifford120052005
Grangeville120221986
Deep Creek119851985
Challis120241989
Centerville120131982
Alturas119871968

Olive-sided Flycatcher Population Trend in Other States

alaskaarizonacaliforniacoloradomainemarylandmassachusettsmichiganminnesotamontananevadanew-hampshirenew-mexiconew-yorknorth-carolinaohiooregonpennsylvaniasouth-dakotautahvermontwashingtonwest-virginiawisconsinwyoming

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