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

American Robin Population Trend in Delaware

All statesForest birds

American Robin in Delaware has increased: up 38% on the route-weighted index since 1968.

+38%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 →
17Routes 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 DelawareNotable 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 Delaware. See the full index history below.

American Robin Population Forecast in Delaware

If the recent trend holds, American Robin in Delaware is projected to rise about 84% by 2029 — from 43 in 2024 to a central estimate of 78 (95% range 50–106). A 5-year backtest shows a typical error of ±86.5%, with 0% of held-out values landing inside the 95% band.

+84%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 →
78Projected 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 →
50–10695% 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 →
±86.5%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, American Robin in Delaware is projected to rise about 84% by 2029 — from 43 in 2024 to a central estimate of 78 (95% range 50–106). A 5-year backtest shows a typical error of ±86.5%, with 0% 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 →
20257648103
20267648104
20277749105
20287850105
20297850106

American Robin Survey Routes in Delaware

Routes recording American Robin in Delaware.
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 →
Milton8920161966
Milton 28520172017
Mt Pleasant7120191966
Frankford6820121966
Holleyville 26820242006
Harrington6520241966
Holleyville6320041966
Frederica6220141966
Bethany Bch4519901966
Dover3719871966
Georgetown3720221992
Lowes Xrds3219911966
Blackbird3220241994
Pepperbox2820161998
Pepperbox 22820242017
Wilmington2020141966
Millsboro2020242017

American Robin Population Trend in Other States

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

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