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

Summer Tanager Population Trend in South Carolina

All statesGeneralists

Summer Tanager in South Carolina has held roughly steady: down 4% on the route-weighted index since 1968.

-4%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 →
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 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 rise about 21% by 2029 — from 6.3 in 2024 to a central estimate of 7.6 (95% range 4.9–10). A 5-year backtest shows a typical error of ±10.6%, with 100% of held-out values landing inside the 95% band.

+21%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 →
7.6Projected 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 →
4.9–1095% 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 →
±10.6%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 rise about 21% by 2029 — from 6.3 in 2024 to a central estimate of 7.6 (95% range 4.9–10). A 5-year backtest shows a typical error of ±10.6%, with 100% 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 →
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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
Sandhills2020241994
Walterboro1420171970
Prosperity1320241992
Kingstree1220102010
Lowrys1220212017
Mount Pisgah1220211998
Holly Hill1120241973
Little Mtn1119881966
Bennettsville1120171998
Hardeeville1020241967
Cauthens Xrd1020211982
Plum Branch920241977
Whitmire920242010
Wagener820241966
Ridgeway820212010
Joanna820231999
Olar820191998
Dale820241998
Barton Creek720221967
Johns Isle619791966
Jamestown620191967
Coward620241966
New Holland620241967
Bishopville620241970

Summer Tanager Population Trend in Other States

alabamaarizonaarkansascaliforniadelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamarylandmississippimissourinebraskanevadanew-jerseynew-mexiconorth-carolinaohiooklahomapennsylvaniatennesseetexasutahvirginiawest-virginiawisconsin

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