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

Pine Warbler Population Trend in Maryland

All statesForest birds

Pine Warbler in Maryland has surged: up 278% on the route-weighted index since 1968.

+278%Since 1968
51Routes In State
58Years

Notable Pine Warbler Trends in Maryland

long arc increasecomputed index

Pine Warbler has surged in Maryland: up 278% on the route-weighted index since 1968.

Pine Warbler Population Forecast in Maryland

If the recent trend holds, Pine Warbler in Maryland is projected to fall about 14% by 2029 — from 6.3 in 2024 to a central estimate of 5.5 (95% range 3.4–7.5). A 5-year backtest shows a typical error of ±22.5%, with 100% of held-out values landing inside the 95% band.

-14%Change by 2029
5.5Projected 2029 index
3.4–7.595% range
±22.5%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
20255.33.27.3
20265.33.37.4
20275.43.37.4
20285.43.37.5
20295.53.47.5

Pine Warbler Survey Routes in Maryland

Routes recording Pine Warbler in Maryland.
Madison6220241966
Cokesbury4320241966
Furnace Town3520242015
Honga1920241966
Forest Grove1920232011
Berlin1520241980
Island Creek1320241991
Oldtown1120241970
Walnut1120241999
Piney Grove1120241995
Sinepuxent1019781966
St. George'S Island1020172015
Snow Hill919761966
Indiantown920141977
Newark820241966
Tall Timbers720141966
Pomonkey720241967
Fruitland619981966
Pomfret520241966
Green Ridge520241995
La Plata420091967
Millington320241967
Melitota320241978
Matthews320241966
Easton320211975

Pine Warbler Population Trend in Other States

alabamaarkansasconnecticutdelawarefloridageorgiaillinoisindianakentuckylouisianamainemassachusettsmichiganminnesotamississippimissourinew-hampshirenew-jerseynew-yorknorth-carolinaohiooklahomapennsylvaniarhode-islandsouth-carolinatennesseetexasvermontvirginiawest-virginiawisconsin

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