Species · Connecticut · BBS 2025 Release · 1966–2024
Chestnut-sided Warbler Population Trend in Connecticut
Chestnut-sided Warbler in Connecticut has fallen sharply: down 62% on the route-weighted index since 1968.
-62%Since 1968
20Routes In State
58Years
Notable Chestnut-sided Warbler Trends in Connecticut
long arc declinecomputed index
Chestnut-sided Warbler has fallen sharply in Connecticut: down 62% on the route-weighted index since 1968.
Chestnut-sided Warbler Population Forecast in Connecticut
If the recent trend holds, Chestnut-sided Warbler in Connecticut is projected to rise about 25% by 2029 — from 2.6 in 2024 to a central estimate of 3.2 (95% range 0.00–6.9). A 5-year backtest shows a typical error of ±60.1%, with 100% of held-out values landing inside the 95% band.
+25%Change by 2029
3.2Projected 2029 index
0.00–6.995% range
±60.1%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 3.4 | 0.00 | 7.1 |
| 2026 | 3.3 | 0.00 | 7.0 |
| 2027 | 3.3 | 0.00 | 7.0 |
| 2028 | 3.2 | 0.00 | 6.9 |
| 2029 | 3.2 | 0.00 | 6.9 |
Chestnut-sided Warbler Survey Routes in Connecticut
| Warren | 29 | 2011 | 1972 |
| Woodstock 2 | 8 | 2024 | 2017 |
| Granby | 7 | 2024 | 1988 |
| New Hartford | 5 | 1987 | 1972 |
| E Hartland | 4 | 1992 | 1966 |
| Woodstock | 4 | 2007 | 1968 |
| Warren 2 | 4 | 2024 | 2012 |
| No Woodbury | 3 | 2024 | 1967 |
| Sherman | 2 | 2019 | 1972 |
| Long Hill | 2 | 2017 | 1974 |
| Mystic | 1 | 2001 | 1973 |
| Buckingham | 1 | 2021 | 1966 |
| Uncasville | 1 | 2021 | 1973 |
| Westbrook | 1 | 1999 | 1978 |
| Willimantic | 1 | 2018 | 1967 |
| Greenwich | 1 | 1997 | 1967 |
| Danbury | 1 | 2019 | 1968 |
| Mid Haddam | 1 | 2022 | 1973 |
| Southington | 1 | 2023 | 1973 |
| New Hartford | 1 | 2024 | 1994 |
Chestnut-sided Warbler Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.