Species · Connecticut · BBS 2025 Release · 1966–2024
Rose-breasted Grosbeak Population Trend in Connecticut
Rose-breasted Grosbeak in Connecticut has fallen sharply: down 72% on the route-weighted index since 1968.
-72%Since 1968
20Routes In State
58Years
Notable Rose-breasted Grosbeak Trends in Connecticut
long arc declinecomputed index
Rose-breasted Grosbeak has fallen sharply in Connecticut: down 72% on the route-weighted index since 1968.
Rose-breasted Grosbeak Population Forecast in Connecticut
If the recent trend holds, Rose-breasted Grosbeak in Connecticut is projected to fall about 94% by 2029 — from 1.9 in 2024 to a central estimate of 0.11 (95% range 0.00–2.5). A 5-year backtest shows a typical error of ±82.2%, with 100% of held-out values landing inside the 95% band.
-94%Change by 2029
0.11Projected 2029 index
0.00–2.595% range
±82.2%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.52 | 0.00 | 2.9 |
| 2026 | 0.42 | 0.00 | 2.8 |
| 2027 | 0.32 | 0.00 | 2.7 |
| 2028 | 0.21 | 0.00 | 2.6 |
| 2029 | 0.11 | 0.00 | 2.5 |
Rose-breasted Grosbeak Survey Routes in Connecticut
| Willimantic | 8 | 2018 | 1967 |
| New Hartford | 7 | 1987 | 1972 |
| Long Hill | 5 | 2019 | 1973 |
| Buckingham | 4 | 2022 | 1966 |
| Uncasville | 4 | 2024 | 1973 |
| E Hartland | 3 | 1992 | 1966 |
| Westbrook | 3 | 2024 | 1972 |
| Sherman | 3 | 2019 | 1972 |
| Warren | 3 | 2011 | 1972 |
| Woodstock | 2 | 2007 | 1968 |
| Greenwich | 2 | 2018 | 1967 |
| Danbury | 2 | 2016 | 1968 |
| Southington | 2 | 2024 | 1973 |
| Woodstock 2 | 2 | 2024 | 2016 |
| Granby | 2 | 2024 | 1989 |
| Mystic | 1 | 2023 | 1973 |
| No Woodbury | 1 | 2024 | 1967 |
| Mid Haddam | 1 | 2024 | 1973 |
| New Hartford | 1 | 2024 | 1994 |
| Warren 2 | 1 | 2024 | 2012 |
Rose-breasted Grosbeak Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.