BirdAnalyst
Species · South Carolina · BBS 2025 Release · 1966–2024

American Robin Population Trend in South Carolina

All statesForest birds

American Robin in South Carolina has edged down: down 11% on the route-weighted index since 1968.

-11%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 →
47Routes 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 South CarolinaNotable 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 South Carolina. See the full index history below.

American Robin Population Forecast in South Carolina

If the recent trend holds, American Robin in South Carolina is projected to rise about 100% by 2029 — from 2.7 in 2024 to a central estimate of 5.4 (95% range 1.3–9.6). A 5-year backtest shows a typical error of ±114.5%, with 80% of held-out values landing inside the 95% band.

+100%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 →
5.4Projected 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 →
1.3–9.695% 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 →
±114.5%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 South Carolina is projected to rise about 100% by 2029 — from 2.7 in 2024 to a central estimate of 5.4 (95% range 1.3–9.6). A 5-year backtest shows a typical error of ±114.5%, 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 →
20255.51.49.6
20265.51.39.6
20275.51.39.6
20285.41.39.6
20295.41.39.6

American Robin Survey Routes in South Carolina

Routes recording American Robin in South Carolina.
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 →
Pendleton5319761966
Landrum4119921972
Chesnee3320151992
Anderson2720181977
Blacksburg2420131998
Little Mtn2219881966
Boiling Spgs2219791967
Salem1220242010
Owings920041992
Salem Xrd820191982
New Ellenton820242010
Barton Creek720221967
Wagener520241977
Boykin Ml Pd519681966
Lowrys520212017
Battlecreek520241999
Prosperity520241992
Dillon420211970
Plum Branch420241977
Ward420212017
Bennettsville420171998
Adams Run420241988
Foreston320211971
Joanna320231999
Cauthens Xrd320211982

American Robin Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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