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

Broad-winged Hawk Population Trend in Maryland

All statesGeneralists

Broad-winged Hawk in Maryland has risen sharply: up 75% on the route-weighted index since 1969.

+75%Since 1969TrendPercent 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 →
48Routes 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 →
57YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Broad-winged Hawk 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 →

long arc increasecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Broad-winged Hawk has risen sharply in Maryland: up 75% on the route-weighted index since 1969.

Broad-winged Hawk Population Forecast in Maryland

If the recent trend holds, Broad-winged Hawk in Maryland is projected to stay roughly flat through 2029, near 0.08 (95% range 0.00–0.18). A 5-year backtest shows a typical error of ±42.5%, with 80% of held-out values landing inside the 95% band.

n/aChange 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 →
0.08Projected 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 →
0.00–0.1895% 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 →
±42.5%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, Broad-winged Hawk in Maryland is projected to stay roughly flat through 2029, near 0.08 (95% range 0.00–0.18). A 5-year backtest shows a typical error of ±42.5%, 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 →
20250.080.000.18
20260.080.000.18
20270.080.000.18
20280.080.000.18
20290.080.000.18

Broad-winged Hawk Survey Routes in Maryland

Routes recording Broad-winged Hawk 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 →
Broomes Isl319811970
Potomac Park220211972
Smithsburg220111977
Berlin219841984
Melitota219791977
Severna Park219821982
Floyd120221969
Mt Nebo119841984
Vindex120161969
Oldtown120241976
Williamsport120062006
Wolfsville120111970
Emmitsburg119811981
Silver Spg119751975
Olney119951990
Norwood119741974
Warfieldsbrg119841984
Pleasant Val119801971
Bachman Mill119841966
Fowblesburg120041989
Eklo119861968
Randallstown119871976
Upper Xrds119741974
Van Bibber119781978
Beltsville119701970

Broad-winged Hawk Population Trend in Other States

alabamaarkansasconnecticutdelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemassachusettsmichiganminnesotamississippimissourinew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawest-virginiawisconsinwyoming

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