Species · Connecticut · BBS 2025 Release · 1966–2024
Brown Thrasher Population Trend in Connecticut
Brown Thrasher in Connecticut has collapsed: down 97% on the route-weighted index since 1968.
-97%Since 1968
19Routes In State
51Years
Notable Brown Thrasher Trends in Connecticut
long arc declinecomputed index
Brown Thrasher has collapsed in Connecticut: down 97% on the route-weighted index since 1968.
Brown Thrasher Population Forecast in Connecticut
If the recent trend holds, Brown Thrasher in Connecticut is projected to fall about 100% by 2029 — from 0.11 in 2024 to a central estimate of 0.00 (95% range 0.00–2.6). A 5-year backtest shows a typical error of ±1446%, with 100% of held-out values landing inside the 95% band.
-100%Change by 2029
0.00Projected 2029 index
0.00–2.695% range
±1446%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.00 | 0.00 | 2.6 |
| 2026 | 0.00 | 0.00 | 2.6 |
| 2027 | 0.00 | 0.00 | 2.6 |
| 2028 | 0.00 | 0.00 | 2.6 |
| 2029 | 0.00 | 0.00 | 2.6 |
Brown Thrasher Survey Routes in Connecticut
| Westbrook | 2 | 1994 | 1969 |
| Mystic | 1 | 2023 | 1973 |
| E Hartland | 1 | 1991 | 1967 |
| Buckingham | 1 | 2001 | 1966 |
| Uncasville | 1 | 2017 | 1973 |
| Woodstock | 1 | 2005 | 1968 |
| Willimantic | 1 | 2007 | 1967 |
| No Woodbury | 1 | 2022 | 1967 |
| Sherman | 1 | 2014 | 1973 |
| Greenwich | 1 | 1996 | 1967 |
| Danbury | 1 | 2012 | 1968 |
| Warren | 1 | 2010 | 1972 |
| Long Hill | 1 | 1990 | 1972 |
| Mid Haddam | 1 | 2006 | 1973 |
| Southington | 1 | 1996 | 1973 |
| New Hartford | 1 | 1987 | 1972 |
| Woodstock 2 | 1 | 2019 | 2017 |
| Warren 2 | 1 | 2024 | 2024 |
| Granby | 1 | 2017 | 1988 |
Brown Thrasher Population Trend in Other States
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Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.