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

American Robin Population Trend in Maryland

All statesForest birds

American Robin in Maryland has held roughly steady: up 6% on the route-weighted index since 1968.

+6%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 →
76Routes 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 American Robin 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 American Robin in Maryland. See the full index history below.

American Robin Population Forecast in Maryland

If the recent trend holds, American Robin in Maryland is projected to rise about 11% by 2029 — from 51 in 2024 to a central estimate of 56 (95% range 41–72). A 5-year backtest shows a typical error of ±34.3%, with 40% 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 →
56Projected 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 →
41–7295% 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 →
±34.3%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 →
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 →
2025564171
2026564171
2027564171
2028564172
2029564172

American Robin Survey Routes in Maryland

Routes recording American Robin 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 →
Emmitsburg17920241966
Wheaton17920241990
Earlton13320242014
Williamsport12820241966
Jennings11720241995
Finzel11720241995
Madonna10120222009
Bachman Mill9520241966
Olney8920241966
Pleasant Val7820241966
Fair Hill7819961992
Severna Park7820111982
Forest Grove7620232011
Wolfsville7320241966
Upper Xrds7320081966
Beltsville7120121966
Largo7119811966
Golden Hill7020241966
Harmony6320171966
Eklo6220181966
Melitota6220241966
Bald Friar6219961992
Ijamsville6220241986
Silver Spg6119891966
La Plata6020091966

American Robin Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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