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Species · Wyoming · BBS 2026 Release · 1966–2025

Hermit Thrush Population Trend in Wyoming

All statesForest birds

Hermit Thrush in Wyoming has surged: up 760% on the route-weighted index since 1976.

+760%Since 1976TrendPercent 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 →
36Routes 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 →
50YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Hermit Thrush 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 →

Hermit Thrush has surged in Wyoming: up 760% on the route-weighted index since 1976.

Hermit Thrush Population Forecast in Wyoming

If the recent trend holds, Hermit Thrush in Wyoming is projected to rise about 16% by 2030 — from 1.7 in 2025 to a central estimate of 1.9 (95% range 0.97–2.9). A 5-year backtest shows a typical error of ±36.1%, with 100% of held-out values landing inside the 95% band.

+16%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 →
1.9Projected 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 →
0.97–2.995% 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 →
±36.1%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, Hermit Thrush in Wyoming is projected to rise about 16% by 2030 — from 1.7 in 2025 to a central estimate of 1.9 (95% range 0.97–2.9). A 5-year backtest shows a typical error of ±36.1%, with 100% of held-out values landing inside the 95% band.19692030
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 →
20261.80.892.8
20271.90.912.8
20281.90.932.8
20291.90.952.9
20301.90.972.9

Hermit Thrush Survey Routes in Wyoming

Routes recording Hermit Thrush 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 →
Fox Park3420251992
Bald Mtn3120251990
West Thumb2619821982
Ryan Park2620252011
Fiddler Lk1520251979
Soda Lake1020251980
Hayden Val919851985
Prior Flats720251991
Colter Bay719991969
Mammoth620251982
Crazy Woman620241982
Hunter Peak520251982
Horse Creek520251980
Moran520162002
Colter Bay 2420252022
Savery 2420252007
Warbonnet320251990
Fletcher Pk320161982
Green River319771977
Ne Entrance220151982
Yellowstone220251987
Meeteetse220172011
Cody120132012
Dubois120251974
Brookhurst120001976

Hermit Thrush Population Trend in Other States

alaskaarizonacaliforniacoloradoconnecticutidahoindianamainemarylandmassachusettsmichiganminnesotamontananevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinaohiooregonpennsylvaniarhode-islandsouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsin

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