Species · Massachusetts · BBS 2025 Release · 1966–2024
Northern Rough-winged Swallow Population Trend in Massachusetts
Northern Rough-winged Swallow in Massachusetts has edged up: up 24% on the route-weighted index since 1970.
+24%Since 1970
29Routes In State
56Years
Notable Northern Rough-winged Swallow Trends in Massachusetts
No notable trend signals for Northern Rough-winged Swallow in Massachusetts. See the full index history below.
Northern Rough-winged Swallow Population Forecast in Massachusetts
If the recent trend holds, Northern Rough-winged Swallow in Massachusetts is projected to fall about 48% by 2029 — from 0.80 in 2024 to a central estimate of 0.42 (95% range 0.00–1.1). A 5-year backtest shows a typical error of ±249.9%, with 100% of held-out values landing inside the 95% band.
-48%Change by 2029
0.42Projected 2029 index
0.00–1.195% range
±249.9%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.42 | 0.00 | 1.1 |
| 2026 | 0.42 | 0.00 | 1.1 |
| 2027 | 0.42 | 0.00 | 1.1 |
| 2028 | 0.42 | 0.00 | 1.1 |
| 2029 | 0.42 | 0.00 | 1.1 |
Northern Rough-winged Swallow Survey Routes in Massachusetts
| Mansfield | 10 | 2024 | 1987 |
| E Pepperell | 4 | 1992 | 1981 |
| Cummington | 4 | 2009 | 1970 |
| Pittsfield | 4 | 2016 | 1989 |
| Ware River | 3 | 2005 | 1994 |
| Sheffield | 3 | 2013 | 1969 |
| N Oxford | 2 | 2017 | 1970 |
| N Orange | 2 | 1979 | 1978 |
| Cheshire | 2 | 1993 | 1993 |
| Hancock | 2 | 2000 | 2000 |
| E Dennis | 1 | 1984 | 1973 |
| Chilmark | 1 | 1981 | 1981 |
| Marion | 1 | 2013 | 1978 |
| Wellfleet | 1 | 1997 | 1992 |
| Prattville | 1 | 2013 | 1967 |
| Brockton | 1 | 2018 | 1985 |
| Maynard | 1 | 1993 | 1990 |
| Littleton | 1 | 1997 | 1975 |
| Princeton | 1 | 1976 | 1972 |
| Belchertown | 1 | 2017 | 1973 |
| Warren | 1 | 2009 | 1969 |
| S Barre | 1 | 1992 | 1969 |
| Chesterfield | 1 | 2019 | 1998 |
| Cape Cod Ns | 1 | 1996 | 1995 |
| Gay Head | 1 | 2012 | 1996 |
Northern Rough-winged Swallow Population Trend in Other States
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Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.