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

Brown Thrasher Population Trend in Wyoming

All statesGeneralists

Brown Thrasher in Wyoming has declined: down 28% on the route-weighted index since 1970.

-28%Since 1970TrendPercent 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 →
54YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Brown Thrasher 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 →

No notable trend signals for Brown Thrasher in Wyoming. See the full index history below.

Brown Thrasher Population Forecast in Wyoming

If the recent trend holds, Brown Thrasher in Wyoming is projected to fall about 39% by 2029 — from 0.07 in 2024 to a central estimate of 0.04 (95% range 0.00–0.20). A 5-year backtest shows a typical error of ±73.6%, with 100% of held-out values landing inside the 95% band.

-39%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 →
0.04Projected 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 →
0.00–0.2095% 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 →
±73.6%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, Brown Thrasher in Wyoming is projected to fall about 39% by 2029 — from 0.07 in 2024 to a central estimate of 0.04 (95% range 0.00–0.20). A 5-year backtest shows a typical error of ±73.6%, 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 →
20250.050.000.21
20260.050.000.21
20270.040.000.21
20280.040.000.21
20290.040.000.20

Brown Thrasher Survey Routes in Wyoming

Routes recording Brown Thrasher 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 →
Wyarno320241974
Yoder320231968
Redbird219891969
Glenrock219731968
Lingle220081992
Cheyenne220152015
Cody120052004
Otto120242001
Basin119711971
Sundance119781978
Nowood120012001
Bill120182018
Brookhurst120151971
Dwyer120191994
Seely 2120212001
Gvnt Valley120232009
Clark120212018
Lovell120241997
Dayton120191994
Arvada120241993
Soda Well120161999
Gebo120211992
Mayoworth120111982
Seedskadee119951995
Riverview120222022

Brown Thrasher Population Trend in Other States

alabamaarkansascoloradoconnecticutdelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawest-virginiawisconsin

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