Species · Pennsylvania · BBS 2025 Release · 1966–2024
Chestnut-sided Warbler Population Trend in Pennsylvania
Chestnut-sided Warbler in Pennsylvania has surged: up 107% on the route-weighted index since 1968.
+107%Since 1968
112Routes In State
58Years
Notable Chestnut-sided Warbler Trends in Pennsylvania
long arc increasecomputed index
Chestnut-sided Warbler has surged in Pennsylvania: up 107% on the route-weighted index since 1968.
Chestnut-sided Warbler Population Forecast in Pennsylvania
If the recent trend holds, Chestnut-sided Warbler in Pennsylvania is projected to rise about 13% by 2029 — from 4.3 in 2024 to a central estimate of 4.9 (95% range 3.7–6.1). A 5-year backtest shows a typical error of ±16.6%, with 80% of held-out values landing inside the 95% band.
+13%Change by 2029
4.9Projected 2029 index
3.7–6.195% range
±16.6%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 4.7 | 3.5 | 5.8 |
| 2026 | 4.7 | 3.6 | 5.9 |
| 2027 | 4.8 | 3.6 | 5.9 |
| 2028 | 4.8 | 3.7 | 6.0 |
| 2029 | 4.9 | 3.7 | 6.1 |
Chestnut-sided Warbler Survey Routes in Pennsylvania
| Odin | 48 | 2024 | 1975 |
| Roulette | 28 | 2021 | 1970 |
| Eldred | 25 | 2022 | 1974 |
| Poyntelle | 25 | 2024 | 1969 |
| Duboistown | 22 | 2024 | 1987 |
| Susquehanna | 21 | 2024 | 1971 |
| Sugar Grove | 19 | 2024 | 1981 |
| Starlight | 18 | 1999 | 1970 |
| Sproul Sf-A | 18 | 2024 | 2002 |
| Roulette 2 | 17 | 2024 | 2022 |
| Laurel Hill | 16 | 2024 | 1978 |
| Sproul Sf-B | 14 | 2024 | 2002 |
| Ridgway | 13 | 2018 | 1967 |
| Honesdale | 12 | 2024 | 1972 |
| Marsh Hill | 11 | 2024 | 1985 |
| Mill Run | 11 | 2024 | 1978 |
| Betula | 10 | 2022 | 1973 |
| Cherry Sprs | 10 | 2023 | 1974 |
| Logue | 9 | 2023 | 1970 |
| Starlight 2 | 9 | 2024 | 2000 |
| Ansonia | 9 | 2024 | 2002 |
| Arnot | 8 | 2024 | 1969 |
| Greentown | 8 | 2024 | 1973 |
| Munson | 8 | 2024 | 1980 |
| Ellenton | 8 | 2024 | 1982 |
Chestnut-sided Warbler Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.