Species · Connecticut · BBS 2025 Release · 1966–2024
Swamp Sparrow Population Trend in Connecticut
Swamp Sparrow in Connecticut has edged up: up 21% on the route-weighted index since 1969.
+21%Since 1969
20Routes In State
57Years
Notable Swamp Sparrow Trends in Connecticut
No notable trend signals for Swamp Sparrow in Connecticut. See the full index history below.
Swamp Sparrow Population Forecast in Connecticut
If the recent trend holds, Swamp Sparrow in Connecticut is projected to rise about 84% by 2029 — from 1.0 in 2024 to a central estimate of 1.8 (95% range 0.00–3.7). A 5-year backtest shows a typical error of ±57.8%, with 100% of held-out values landing inside the 95% band.
+84%Change by 2029
1.8Projected 2029 index
0.00–3.795% range
±57.8%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 1.8 | 0.00 | 3.7 |
| 2026 | 1.8 | 0.00 | 3.7 |
| 2027 | 1.8 | 0.00 | 3.7 |
| 2028 | 1.8 | 0.00 | 3.7 |
| 2029 | 1.8 | 0.00 | 3.7 |
Swamp Sparrow Survey Routes in Connecticut
| Warren | 34 | 2011 | 1972 |
| Buckingham | 5 | 2004 | 1972 |
| Warren 2 | 5 | 2024 | 2017 |
| Woodstock 2 | 3 | 2024 | 2016 |
| Woodstock | 2 | 2003 | 1968 |
| Willimantic | 2 | 1998 | 1967 |
| New Hartford | 2 | 1987 | 1974 |
| Mystic | 1 | 2023 | 1980 |
| E Hartland | 1 | 1989 | 1968 |
| Uncasville | 1 | 1993 | 1993 |
| Westbrook | 1 | 1994 | 1977 |
| No Woodbury | 1 | 2022 | 1967 |
| Sherman | 1 | 2016 | 1974 |
| Greenwich | 1 | 1990 | 1978 |
| Danbury | 1 | 2023 | 1975 |
| Long Hill | 1 | 1984 | 1981 |
| Mid Haddam | 1 | 2021 | 1983 |
| Southington | 1 | 1984 | 1977 |
| New Hartford | 1 | 2021 | 1998 |
| Granby | 1 | 2024 | 1991 |
Swamp Sparrow Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.