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

Song Sparrow Population Trend in Maryland

All statesGeneralists

Song Sparrow in Maryland has increased: up 31% on the route-weighted index since 1968.

+31%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 →
75Routes 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 Song Sparrow 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 Song Sparrow in Maryland. See the full index history below.

Song Sparrow Population Forecast in Maryland

If the recent trend holds, Song Sparrow in Maryland is projected to rise about 11% by 2029 — from 15 in 2024 to a central estimate of 16 (95% range 11–21). A 5-year backtest shows a typical error of ±10.5%, with 100% of held-out values landing inside the 95% band.

+11%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 →
16Projected 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 →
11–2195% 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 →
±10.5%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, Song Sparrow in Maryland is projected to rise about 11% by 2029 — from 15 in 2024 to a central estimate of 16 (95% range 11–21). A 5-year backtest shows a typical error of ±10.5%, 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 →
2025161121
2026161121
2027161121
2028161121
2029161121

Song Sparrow Survey Routes in Maryland

Routes recording Song Sparrow 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 →
Emmitsburg6420241966
Madonna5620222009
Earlton5320242014
Eklo4620181966
Largo4619811966
Finzel3920241995
Wheaton3920241990
Olney3820241966
Jennings3720241995
Silver Spg3519891966
Ijamsville3220241986
Mt Nebo2819911969
Pleasant Val2820241966
Potomac Park2720241970
Bachman Mill2720241966
La Plata2720091966
Williamsport2620241966
Warfieldsbrg2620241966
Floyd2420241966
Accident2220171992
Davidsnville2220241982
Norwood2120121966
Upper Xrds2120081966
Accident 22020242018
Fair Hill1919961992

Song Sparrow Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawaregeorgiaidahoillinoisindianaiowakansaskentuckymainemassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseeutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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