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Species · Maryland · BBS 2026 Release · 1966–2025

Fish Crow Population Trend in Maryland

All statesGeneralists

Fish Crow in Maryland has surged: up 223% on the route-weighted index since 1968.

+223%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 →
68Routes 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 →
59YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Fish Crow 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 →

Fish Crow has surged in Maryland: up 223% on the route-weighted index since 1968.

Fish Crow Population Forecast in Maryland

If the recent trend holds, Fish Crow in Maryland is projected to rise about 27% by 2030 — from 5.1 in 2025 to a central estimate of 6.5 (95% range 4.5–8.4). A 5-year backtest shows a typical error of ±12.7%, with 100% of held-out values landing inside the 95% band.

+27%Change by 2030TrendPercent 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 →
6.5Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
4.5–8.495% 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 →
±12.7%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, Fish Crow in Maryland is projected to rise about 27% by 2030 — from 5.1 in 2025 to a central estimate of 6.5 (95% range 4.5–8.4). A 5-year backtest shows a typical error of ±12.7%, with 100% of held-out values landing inside the 95% band.19662030
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 →
20266.24.38.1
20276.34.38.2
20286.34.48.3
20296.44.58.3
20306.54.58.4

Fish Crow Survey Routes in Maryland

Routes recording Fish Crow 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 →
Wheaton4220251990
Olney1720251966
Norwood1720121971
Piney Neck1620251966
Cokesbury1620251966
Ijamsville1520251986
Sinepuxent1319781966
Walnut1320241999
Forest Grove1220232012
Williamsport1120251966
Eklo1120181972
Randallstown1120131972
St. George'S Island1020172015
Emmitsburg920251966
Harmony920171966
Nottingham920252013
Warfieldsbrg820251966
Tall Timbers820141966
Elkton820251970
Millington820251968
Madonna820222009
Silver Spg619891977
Beltsville620121966
Melitota620251966
Van Bibber520131966

Fish Crow Population Trend in Other States

alabamaarkansasconnecticutdelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemassachusettsmississippimissourinew-hampshirenew-jerseynew-yorknorth-carolinaohiooklahomapennsylvaniarhode-islandsouth-carolinatennesseetexasvermontvirginiawest-virginia

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.