Species · Connecticut · BBS 2025 Release · 1966–2024
White-throated Sparrow Population Trend in Connecticut
White-throated Sparrow in Connecticut has fallen sharply: down 64% on the route-weighted index since 1968.
-64%Since 1968
10Routes In State
25Years
Notable White-throated Sparrow Trends in Connecticut
long arc declinecomputed index
White-throated Sparrow has fallen sharply in Connecticut: down 64% on the route-weighted index since 1968.
White-throated Sparrow Population Forecast in Connecticut
If the recent trend holds, White-throated Sparrow in Connecticut is projected to fall about 100% by 2027 — from 0.09 in 2022 to a central estimate of 0.00 (95% range 0.00–0.49). A 5-year backtest shows a typical error of ±288.8%, with 80% of held-out values landing inside the 95% band.
-100%Change by 2027
0.00Projected 2027 index
0.00–0.4995% range
±288.8%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2023 | 0.00 | 0.00 | 0.49 |
| 2024 | 0.00 | 0.00 | 0.49 |
| 2025 | 0.00 | 0.00 | 0.49 |
| 2026 | 0.00 | 0.00 | 0.49 |
| 2027 | 0.00 | 0.00 | 0.49 |
White-throated Sparrow Survey Routes in Connecticut
| New Hartford | 3 | 1997 | 1995 |
| Woodstock | 2 | 1987 | 1972 |
| Mid Haddam | 2 | 1994 | 1974 |
| Mystic | 1 | 2022 | 2022 |
| E Hartland | 1 | 1973 | 1966 |
| No Woodbury | 1 | 1975 | 1974 |
| Greenwich | 1 | 1972 | 1972 |
| Danbury | 1 | 1983 | 1973 |
| Warren | 1 | 1991 | 1972 |
| New Hartford | 1 | 1977 | 1972 |
White-throated Sparrow Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.