Species · Vermont · BBS 2025 Release · 1966–2024
Brown Thrasher Population Trend in Vermont
Brown Thrasher in Vermont has collapsed: down 75% on the route-weighted index since 1968.
-75%Since 1968
24Routes In State
57Years
Notable Brown Thrasher Trends in Vermont
long arc declinecomputed index
Brown Thrasher has collapsed in Vermont: down 75% on the route-weighted index since 1968.
Brown Thrasher Population Forecast in Vermont
If the recent trend holds, Brown Thrasher in Vermont is projected to fall about 100% by 2029 — from 0.11 in 2024 to a central estimate of 0.00 (95% range 0.00–0.72). A 5-year backtest shows a typical error of ±188.3%, with 100% of held-out values landing inside the 95% band.
-100%Change by 2029
0.00Projected 2029 index
0.00–0.7295% range
±188.3%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.00 | 0.00 | 0.72 |
| 2026 | 0.00 | 0.00 | 0.72 |
| 2027 | 0.00 | 0.00 | 0.72 |
| 2028 | 0.00 | 0.00 | 0.72 |
| 2029 | 0.00 | 0.00 | 0.72 |
Brown Thrasher Survey Routes in Vermont
| East Haven | 3 | 2023 | 1966 |
| Waterville | 3 | 1980 | 1967 |
| Hardwick | 2 | 2011 | 1968 |
| Marlboro | 1 | 1991 | 1966 |
| North Pownal | 1 | 2009 | 1966 |
| Stratton | 1 | 1998 | 1973 |
| Landgrove | 1 | 2023 | 1966 |
| S Reading | 1 | 2017 | 1966 |
| Gaysville | 1 | 2006 | 1966 |
| Post Mills | 1 | 2022 | 1966 |
| Shaftsbury | 1 | 2023 | 1966 |
| S Wallingfrd | 1 | 2019 | 1966 |
| W Rutland | 1 | 2019 | 1967 |
| St Johnsbury | 1 | 2018 | 1970 |
| Northfld Fls | 1 | 1993 | 1980 |
| Middlesex | 1 | 1986 | 1971 |
| East Calais | 1 | 1998 | 1969 |
| Newbury | 1 | 1995 | 1995 |
| Greensboro | 1 | 2015 | 1968 |
| Fletcher | 1 | 2024 | 1968 |
| Hinesburg | 1 | 1992 | 1966 |
| Colchester | 1 | 2022 | 2013 |
| Grand Isle | 1 | 2024 | 1967 |
| Bristol | 1 | 2009 | 1996 |
Brown Thrasher Population Trend in Other States
alabamaarkansascoloradoconnecticutdelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvirginiawest-virginiawisconsinwyoming
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.