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

Wood Thrush Population Trend in Delaware

All statesForest birds

Wood Thrush in Delaware has edged down: down 12% on the route-weighted index since 1968.

-12%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 →
17Routes 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 DelawareNotable 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 Delaware. See the full index history below.

Wood Thrush Population Forecast in Delaware

If the recent trend holds, Wood Thrush in Delaware is projected to rise about 33% by 2029 — from 5.0 in 2024 to a central estimate of 6.6 (95% range 0.00–16). A 5-year backtest shows a typical error of ±26.2%, with 100% of held-out values landing inside the 95% band.

+33%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 →
6.6Projected 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 →
0.00–1695% 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 →
±26.2%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 Delaware is projected to rise about 33% by 2029 — from 5.0 in 2024 to a central estimate of 6.6 (95% range 0.00–16). A 5-year backtest shows a typical error of ±26.2%, 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 →
20257.30.0016
20267.10.0016
20277.00.0016
20286.80.0016
20296.60.0016

Wood Thrush Survey Routes in Delaware

Routes recording Wood Thrush in Delaware.
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 →
Lowes Xrds1519911966
Blackbird1520241994
Frankford1020121966
Holleyville1020041966
Milton 2820172017
Mt Pleasant720191966
Dover519871966
Milton420161966
Pepperbox 2420242017
Harrington320241966
Frederica320141966
Georgetown320221992
Wilmington220141966
Holleyville 2220242006
Bethany Bch119861967
Millsboro120242017
Pepperbox120161998

Wood Thrush Population Trend in Other States

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

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