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

Hermit Thrush Population Trend in Wyoming

All statesForest birds

Hermit Thrush in Wyoming has surged: up 704% on the route-weighted index since 1976.

+704%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 →
35Routes 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 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 704% 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 20% by 2029 — from 1.6 in 2024 to a central estimate of 1.9 (95% range 0.95–2.9). A 5-year backtest shows a typical error of ±33.3%, with 100% of held-out values landing inside the 95% band.

+20%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 →
1.9Projected 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 →
0.95–2.995% 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 →
±33.3%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, Hermit Thrush in Wyoming is projected to rise about 20% by 2029 — from 1.6 in 2024 to a central estimate of 1.9 (95% range 0.95–2.9). A 5-year backtest shows a typical error of ±33.3%, with 100% of held-out values landing inside the 95% band.19692029
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 →
20251.80.872.8
20261.90.892.8
20271.90.912.8
20281.90.932.9
20291.90.952.9

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 Park4820241992
Bald Mtn2820241990
West Thumb2619821982
Ryan Park1620232011
Horse Creek1520241980
Fiddler Lk1420241979
Hayden Val919851985
Buckskin Mtn820211980
Colter Bay719991969
Savery 2720242007
Crazy Woman620241982
Prior Flats520241991
Hunter Peak520241982
Moran520162002
Yellowstone320221987
Mammoth320241982
Colter Bay 2320242022
Soda Lake320241980
Fletcher Pk320161982
Green River319771977
Ne Entrance220151982
Dubois220231974
Meeteetse220172011
Warbonnet220241990
Cody120132012

Hermit Thrush Population Trend in Other States

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

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