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

Summer Tanager Population Trend in South Carolina

All statesForest birds

Summer Tanager in South Carolina has held roughly steady: down 3% on the route-weighted index since 1968.

-3%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 Summer Tanager 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 Summer Tanager in South Carolina. See the full index history below.

Summer Tanager Population Forecast in South Carolina

If the recent trend holds, Summer Tanager in South Carolina is projected to stay roughly flat through 2030, near 7.7 (95% range 5.0–10). A 5-year backtest shows a typical error of ±11.4%, with 100% of held-out values landing inside the 95% band.

-9%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 →
7.7Projected 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 →
5.0–1095% 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 →
±11.4%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, Summer Tanager in South Carolina is projected to stay roughly flat through 2030, near 7.7 (95% range 5.0–10). A 5-year backtest shows a typical error of ±11.4%, 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 →
20267.75.010
20277.75.010
20287.75.010
20297.75.010
20307.75.010

Summer Tanager Survey Routes in South Carolina

Routes recording Summer Tanager 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
Greenwood2020251998
Coward1920251966
Nixville1920251998
Sandhills1820251994
Ward1320252017
Prosperity1320241992
New Ellenton1220252010
Kingstree1220102010
Mount Pisgah1220251998
Dale1220251998
Bishopville1120251970
Little Mtn1119881966
Bennettsville1120171998
Holly Hill1020251973
Cauthens Xrd1020211982
New Holland920251967
Walterboro920251970
Plum Branch920251977
Whitmire920242010
Olar820191998
Hardeeville720251967
Foreston720251966
Barton Creek720221967
Joanna720251999

Summer Tanager Population Trend in Other States

alabamaarizonaarkansascaliforniadelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamarylandmississippimissourinebraskanevadanew-jerseynew-mexiconorth-carolinaohiooklahomapennsylvaniatennesseetexasutahvirginiawest-virginiawisconsin

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