BirdAnalyst
Species · Maryland · BBS 2025 Release · 1966–2024

Warbling Vireo Population Trend in Maryland

All statesForest birds

Warbling Vireo in Maryland has surged: up 233% on the route-weighted index since 1968.

+233%Since 1968
47Routes In State
58Years

Notable Warbling Vireo Trends in Maryland

long arc increasecomputed index

Warbling Vireo has surged in Maryland: up 233% on the route-weighted index since 1968.

Warbling Vireo Population Forecast in Maryland

If the recent trend holds, Warbling Vireo in Maryland is projected to fall about 22% by 2029 — from 0.93 in 2024 to a central estimate of 0.72 (95% range 0.47–0.98). A 5-year backtest shows a typical error of ±27.1%, with 40% of held-out values landing inside the 95% band.

-22%Change by 2029
0.72Projected 2029 index
0.47–0.9895% range
±27.1%Backtest error
19662029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected index95% low95% high
20250.690.430.94
20260.690.440.95
20270.700.450.96
20280.710.460.97
20290.720.470.98

Warbling Vireo Survey Routes in Maryland

Routes recording Warbling Vireo in Maryland.
Earlton1620242014
Smithsburg620141967
Emmitsburg620241967
Fair Hill519961992
Williamsport420241974
Berlin320052005
Madonna320222009
Floyd220052005
Olney220241970
Bachman Mill220241996
Randallstown220131971
Upper Xrds220061966
Van Bibber220111966
Northeast220081966
Piney Neck220221967
Ijamsville220241986
Oldtown120241977
Potomac Park120241970
Wolfsville120241977
Silver Spg119791979
Norwood119781969
Warfieldsbrg120231967
Pleasant Val120241975
Fowblesburg120161972
Eklo120141988

Warbling Vireo Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawareidahoillinoisindianaiowakansaskentuckylouisianamainemassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.