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

Chuck-will's-widow Population Trend in Maryland

All statesAerial insectivores

Chuck-will's-widow in Maryland has held roughly steady: down 2% on the route-weighted index since 1968.

-2%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 →
23Routes 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 Chuck-will's-widow 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 Chuck-will's-widow in Maryland. See the full index history below.

Chuck-will's-widow Population Forecast in Maryland

If the recent trend holds, Chuck-will's-widow in Maryland is projected to stay roughly flat through 2029, near 0.26 (95% range 0.00–0.56). A 5-year backtest shows a typical error of ±27.7%, with 80% of held-out values landing inside the 95% band.

-10%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 →
0.26Projected 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 →
0.00–0.5695% 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 →
±27.7%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, Chuck-will's-widow in Maryland is projected to stay roughly flat through 2029, near 0.26 (95% range 0.00–0.56). A 5-year backtest shows a typical error of ±27.7%, with 80% 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 →
20250.280.000.57
20260.270.000.57
20270.270.000.57
20280.260.000.56
20290.260.000.56

Chuck-will's-widow Survey Routes in Maryland

Routes recording Chuck-will's-widow 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 →
Cokesbury520241983
Sinepuxent519781966
Furnace Town520232015
Melitota319811981
Honga320231966
Madison320241968
Berlin220221980
Vienna220241972
Fruitland219961974
Mardela220141967
Walnut120071999
Indiantown120142001
Pt Republic119891985
Tall Timbers120021966
La Plata119811981
Hughesville119891968
Theodore119931993
Northeast120102010
Piney Neck120191967
Easton120131969
Golden Hill120241967
Newark120241966
Snow Hill119671967

Chuck-will's-widow Population Trend in Other States

alabamaarkansasdelawarefloridageorgiaillinoisindianakansaskentuckylouisianamississippimissourinebraskanew-jerseynorth-carolinaohiooklahomasouth-carolinatennesseetexasvirginiawest-virginia

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