Species · Maryland · BBS 2025 Release · 1966–2024
Blue-winged Warbler Population Trend in Maryland
Blue-winged Warbler in Maryland has declined: down 35% on the route-weighted index since 1971.
-35%Since 1971
21Routes In State
49Years
Notable Blue-winged Warbler Trends in Maryland
No notable trend signals for Blue-winged Warbler in Maryland. See the full index history below.
Blue-winged Warbler Population Forecast in Maryland
If the recent trend holds, Blue-winged Warbler in Maryland is projected to stay roughly flat through 2029, near 0.04 (95% range 0.00–0.11). A 5-year backtest shows a typical error of ±29.5%, with 100% of held-out values landing inside the 95% band.
n/aChange by 2029
0.04Projected 2029 index
0.00–0.1195% range
±29.5%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.04 | 0.00 | 0.11 |
| 2026 | 0.04 | 0.00 | 0.11 |
| 2027 | 0.04 | 0.00 | 0.11 |
| 2028 | 0.04 | 0.00 | 0.11 |
| 2029 | 0.04 | 0.00 | 0.11 |
Blue-winged Warbler Survey Routes in Maryland
| Vindex | 1 | 1978 | 1978 |
| Oldtown | 1 | 2019 | 1995 |
| Potomac Park | 1 | 2022 | 1973 |
| Williamsport | 1 | 2005 | 2002 |
| Smithsburg | 1 | 2011 | 1975 |
| Wolfsville | 1 | 2013 | 1970 |
| Olney | 1 | 2024 | 1981 |
| Pleasant Val | 1 | 1987 | 1977 |
| Bachman Mill | 1 | 2007 | 1989 |
| Eklo | 1 | 2016 | 1995 |
| Randallstown | 1 | 2005 | 1977 |
| Beltsville | 1 | 1975 | 1975 |
| Madonna | 1 | 2014 | 2013 |
| Earlton | 1 | 2014 | 2014 |
| Pomfret | 1 | 1995 | 1989 |
| Theodore | 1 | 1988 | 1975 |
| Northeast | 1 | 1997 | 1968 |
| Elkton | 1 | 1996 | 1996 |
| Jennings | 1 | 1995 | 1995 |
| Green Ridge | 1 | 2024 | 1995 |
| Ijamsville | 1 | 2005 | 1994 |
Blue-winged Warbler Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.