Species · Connecticut · BBS 2025 Release · 1966–2024
Purple Martin Population Trend in Connecticut
Purple Martin in Connecticut has edged down: down 22% on the route-weighted index since 1973.
-22%Since 1973
12Routes In State
23Years
Notable Purple Martin Trends in Connecticut
No notable trend signals for Purple Martin in Connecticut. See the full index history below.
Purple Martin Population Forecast in Connecticut
If the recent trend holds, Purple Martin in Connecticut is projected to rise about 240% by 2029 — from 0.11 in 2024 to a central estimate of 0.38 (95% range 0.00–0.86). A 5-year backtest shows a typical error of ±173%, with 100% of held-out values landing inside the 95% band.
+240%Change by 2029
0.38Projected 2029 index
0.00–0.8695% range
±173%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.37 | 0.00 | 0.85 |
| 2026 | 0.37 | 0.00 | 0.85 |
| 2027 | 0.37 | 0.00 | 0.86 |
| 2028 | 0.37 | 0.00 | 0.86 |
| 2029 | 0.38 | 0.00 | 0.86 |
Purple Martin Survey Routes in Connecticut
| Woodstock | 5 | 2005 | 2005 |
| Sherman | 5 | 2019 | 1976 |
| Danbury | 3 | 2022 | 1976 |
| Southington | 2 | 1997 | 1997 |
| Mystic | 1 | 2022 | 1981 |
| Buckingham | 1 | 1998 | 1966 |
| Uncasville | 1 | 2012 | 2012 |
| Westbrook | 1 | 2023 | 1978 |
| Willimantic | 1 | 1991 | 1991 |
| No Woodbury | 1 | 1979 | 1971 |
| Warren | 1 | 1973 | 1973 |
| Mid Haddam | 1 | 2024 | 1977 |
Purple Martin Population Trend in Other States
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Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.