BirdAnalyst
Species · BCR 29 · BBS 2025 Release · 1966–2024

Summer Tanager In Piedmont

All regionsPiedmontGeneralists

Summer Tanager in Piedmont has risen sharply: up 72% on the route-weighted index since 1968.

+72%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 →
127Routes In RegionSurvey 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 SignalsNotable 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 increasecomputed 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 →

Summer Tanager has risen sharply in Piedmont: up 72% on the route-weighted index since 1968.

Summer Tanager In Piedmont Population Forecast

If the recent trend holds, Summer Tanager in Piedmont is projected to stay roughly flat through 2029, near 4.5 (95% range 3.4–5.6). A 5-year backtest shows a typical error of ±11.4%, with 80% of held-out values landing inside the 95% band.

+2%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 →
4.5Projected 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 →
3.4–5.695% 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 →
±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 Piedmont is projected to stay roughly flat through 2029, near 4.5 (95% range 3.4–5.6). A 5-year backtest shows a typical error of ±11.4%, 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 →
20254.43.35.4
20264.43.35.5
20274.43.45.5
20284.53.45.5
20294.53.45.6

Routes In Piedmont

Routes recording Summer Tanager in Piedmont.
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 →
Liberty City 2ALABAMA292024
Piedmont NwrGEORGIA272003
Liberty CityALABAMA242011
Salem XrdSOUTH-CAROLINA222019
FinchleyVIRGINIA202021
RolandGEORGIA192024
Carrs StationGEORGIA182024
Lincolnton 2GEORGIA172024
BullockNORTH-CAROLINA162024
BrodnaxVIRGINIA152024
RutledgeGEORGIA142024
JulietteGEORGIA142024
ArcolaNORTH-CAROLINA142024
ProsperitySOUTH-CAROLINA132024
LanettALABAMA122024
BiscoeNORTH-CAROLINA122017
Uwharrie NfNORTH-CAROLINA122001
LowrysSOUTH-CAROLINA122021
WhitesburgGEORGIA112024
OakboroNORTH-CAROLINA112024
Little MtnSOUTH-CAROLINA111988
Nixburg 2ALABAMA102024
MaxeysGEORGIA102024
DurhamNORTH-CAROLINA102024
Cauthens XrdSOUTH-CAROLINA102021

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