Species · Maine · BBS 2025 Release · 1966–2024
Northern Rough-winged Swallow Population Trend in Maine
Northern Rough-winged Swallow in Maine has collapsed: down 92% on the route-weighted index since 1972.
-92%Since 1972
27Routes In State
38Years
Notable Northern Rough-winged Swallow Trends in Maine
long arc declinecomputed index
Northern Rough-winged Swallow has collapsed in Maine: down 92% on the route-weighted index since 1972.
Northern Rough-winged Swallow Population Forecast in Maine
If the recent trend holds, Northern Rough-winged Swallow in Maine is projected to stay roughly flat through 2027, near 0.00 (95% range 0.00–0.29). A 5-year backtest shows a typical error of ±208.4%, with 100% of held-out values landing inside the 95% band.
n/aChange by 2027
0.00Projected 2027 index
0.00–0.2995% range
±208.4%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2023 | 0.00 | 0.00 | 0.29 |
| 2024 | 0.00 | 0.00 | 0.29 |
| 2025 | 0.00 | 0.00 | 0.29 |
| 2026 | 0.00 | 0.00 | 0.29 |
| 2027 | 0.00 | 0.00 | 0.29 |
Northern Rough-winged Swallow Survey Routes in Maine
| Benton | 17 | 1972 | 1971 |
| Moose River | 4 | 1994 | 1994 |
| Bethel | 2 | 2006 | 2006 |
| East Troy | 2 | 1993 | 1982 |
| Hermon | 2 | 1987 | 1982 |
| Hudson | 2 | 1989 | 1983 |
| Church Hill | 2 | 2013 | 2013 |
| Northfield 2 | 1 | 2022 | 2022 |
| Westbrook | 1 | 2007 | 2007 |
| Biddeford | 1 | 1983 | 1976 |
| Newcastle | 1 | 1986 | 1986 |
| Turner | 1 | 1991 | 1989 |
| Reeds | 1 | 2009 | 1996 |
| Otisfield Gr | 1 | 2012 | 1978 |
| Hartford | 1 | 2021 | 1999 |
| Bowdoin Ctr | 1 | 2005 | 2005 |
| Manchester | 1 | 1989 | 1989 |
| Warren | 1 | 1974 | 1974 |
| Freedom | 1 | 2004 | 1975 |
| Harmony | 1 | 2016 | 1967 |
| Hancock | 1 | 1993 | 1974 |
| Castine | 1 | 1986 | 1986 |
| Aurora | 1 | 2016 | 2005 |
| Cooper | 1 | 2010 | 1975 |
| Cambridge | 1 | 2008 | 2008 |
Northern Rough-winged Swallow Population Trend in Other States
alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.