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Species · Wyoming · BBS 2026 Release · 1966–2025

Olive-sided Flycatcher Population Trend in Wyoming

All statesAerial insectivores

Olive-sided Flycatcher in Wyoming has surged: up 224% on the route-weighted index since 1978.

+224%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 →
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 →
49YearsYears 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 WyomingNotable 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 Wyoming: up 224% on the route-weighted index since 1978.

Olive-sided Flycatcher Population Forecast in Wyoming

If the recent trend holds, Olive-sided Flycatcher in Wyoming is projected to fall about 47% by 2030 — from 0.47 in 2025 to a central estimate of 0.25 (95% range 0.09–0.41). A 5-year backtest shows a typical error of ±47.4%, with 60% of held-out values landing inside the 95% band.

-47%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 →
0.25Projected 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 →
0.09–0.4195% 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 →
±47.4%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, Olive-sided Flycatcher in Wyoming is projected to fall about 47% by 2030 — from 0.47 in 2025 to a central estimate of 0.25 (95% range 0.09–0.41). A 5-year backtest shows a typical error of ±47.4%, with 60% 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 →
20260.240.080.40
20270.240.080.40
20280.240.080.40
20290.240.080.41
20300.250.090.41

Olive-sided Flycatcher Survey Routes in Wyoming

Routes recording Olive-sided Flycatcher in Wyoming.
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 →
Hunter Peak720251982
Ryan Park720252012
Colter Bay519991968
Horse Creek420251980
Soda Lake420251995
Warbonnet420251999
Alpine320251979
Buckskin Mtn320251992
Ne Entrance220251982
Yellowstone220252003
Cumberland219781978
Mammoth220241987
Bald Mtn220231994
Wilson220251979
Fiddler Lk220251990
Fox Park220242015
Prior Flats119911991
Sundance119851985
Dubois120251984
Savery119931989
Buford120252025
Moose120231976
Meeteetse120102010
Crazy Woman120091981
Moskee119971997

Olive-sided Flycatcher Population Trend in Other States

alaskaarizonacaliforniacoloradoidahomainemarylandmassachusettsmichiganminnesotamontananevadanew-hampshirenew-mexiconew-yorknorth-carolinaohiooregonpennsylvaniasouth-dakotautahvermontwashingtonwest-virginiawisconsin

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