BirdAnalyst
Species · South Carolina · BBS 2026 Release · 1966–2025

Common Yellowthroat Population Trend in South Carolina

All statesForest birds

Common Yellowthroat in South Carolina has fallen sharply: down 74% on the route-weighted index since 1968.

-74%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 →
51Routes 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 Common Yellowthroat 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 →

long arc declinecomputed 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 →

Common Yellowthroat has fallen sharply in South Carolina: down 74% on the route-weighted index since 1968.

Common Yellowthroat Population Forecast in South Carolina

If the recent trend holds, Common Yellowthroat in South Carolina is projected to stay roughly flat through 2030, near 2.6 (95% range 0.00–6.6). A 5-year backtest shows a typical error of ±37.7%, with 100% of held-out values landing inside the 95% band.

-5%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 →
2.6Projected 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 →
0.00–6.695% 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 →
±37.7%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, Common Yellowthroat in South Carolina is projected to stay roughly flat through 2030, near 2.6 (95% range 0.00–6.6). A 5-year backtest shows a typical error of ±37.7%, 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 →
20263.20.007.1
20273.00.007.0
20282.90.006.9
20292.80.006.7
20302.60.006.6

Common Yellowthroat Survey Routes in South Carolina

Routes recording Common Yellowthroat 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 →
Salem Xrd2220191982
Pendleton1619761966
Carvers Bay1520121998
Kingstree1220102010
Bennettsville1220171998
Boykin Ml Pd1119681966
Greenwood1120251998
Battlecreek1020251999
Chesnee920151992
Jamestown820191967
Walterboro820171970
Barton Creek820221968
Owings620041992
Sandhills620251994
Blacksburg620131998
Plum Branch520251978
Ridgeway520212010
Pinewood520191998
Adams Run520251988
Cauthens Xrd520211982
Foreston420251966
New Holland420251967
Boiling Spgs419791967
Ward420252017
Whitmire420242010

Common Yellowthroat Population Trend in Other States

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

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