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

Wood Thrush Population Trend in Maryland

All statesForest birds

Wood Thrush in Maryland has declined: down 49% on the route-weighted index since 1968.

-49%Since 1968TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
76Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
58YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Wood Thrush Trends in MarylandNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

No notable trend signals for Wood Thrush in Maryland. See the full index history below.

Wood Thrush Population Forecast in Maryland

If the recent trend holds, Wood Thrush in Maryland is projected to stay roughly flat through 2029, near 9.2 (95% range 5.3–13). A 5-year backtest shows a typical error of ±9.4%, with 100% of held-out values landing inside the 95% band.

-6%Change by 2029TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
9.2Projected 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
5.3–1395% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±9.4%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, Wood Thrush in Maryland is projected to stay roughly flat through 2029, near 9.2 (95% range 5.3–13). A 5-year backtest shows a typical error of ±9.4%, with 100% of held-out values landing inside the 95% band.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 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
202510.06.014
20269.85.914
20279.65.714
20289.45.513
20299.25.313

Wood Thrush Survey Routes in Maryland

Routes recording Wood Thrush in Maryland.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →
Piney Grove3620241995
Snow Hill3019761966
Sinepuxent2919781966
Finzel2920241995
Earlton2920242014
Grove Neck2819961992
Smithsburg2720141966
Eklo2720181966
La Plata2720091966
Bald Friar2719961992
Largo2219811966
Fair Hill2219961992
Pomfret2120241966
Olney2020241966
Cheltenham2020041966
Pomonkey1920241966
Wolfsville1820241966
Van Bibber1720131966
Pt Republic1719891966
Green Ridge1720241995
Emmitsburg1620241966
Madonna1520222009
Nottingham1420242005
Bachman Mill1320241966
Island Creek1320241991

Wood Thrush Population Trend in Other States

alabamaarkansasconnecticutdelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemassachusettsmichiganminnesotamississippimissourinebraskanew-hampshirenew-jerseynew-yorknorth-carolinaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawest-virginiawisconsin

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