BirdAnalyst
Species · Louisiana · BBS 2025 Release · 1966–2024

Summer Tanager Population Trend in Louisiana

All statesGeneralists

Summer Tanager in Louisiana has increased: up 33% on the route-weighted index since 1969.

+33%Since 1969TrendPercent 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 →
84Routes 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 →
57YearsYears 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 LouisianaNotable 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 Louisiana. See the full index history below.

Summer Tanager Population Forecast in Louisiana

If the recent trend holds, Summer Tanager in Louisiana is projected to fall about 23% by 2029 — from 6.6 in 2024 to a central estimate of 5.0 (95% range 3.0–7.1). A 5-year backtest shows a typical error of ±20.3%, with 100% of held-out values landing inside the 95% band.

-23%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 →
5.0Projected 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 →
3.0–7.195% 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 →
±20.3%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 Louisiana is projected to fall about 23% by 2029 — from 6.6 in 2024 to a central estimate of 5.0 (95% range 3.0–7.1). A 5-year backtest shows a typical error of ±20.3%, with 100% of held-out values landing inside the 95% band.19672029
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 →
20255.03.07.1
20265.03.07.1
20275.03.07.1
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20295.03.07.1

Summer Tanager Survey Routes in Louisiana

Routes recording Summer Tanager in Louisiana.
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 →
Longstreet2320241967
Goodwill2020242004
Natchez1920241992
Mount Union1720241998
Derry1519891967
Womack1520241999
Tensas Nwr1520241987
Easton1419901967
Clay1320241968
Norwood1320242004
Frogmore1220241998
Ivan1220131998
Atchafalaya1220241989
Marion1119961988
Ivan 21120162014
Evelyn1120242004
Fillmore1019891968
Many1019921989
Linville1020241998
Enterprise1020242006
Plettenberg920221968
Oakdale919941991
Derry 2920241990
Hargis 2920142013
Shaw820241967

Summer Tanager Population Trend in Other States

alabamaarizonaarkansascaliforniadelawarefloridageorgiaillinoisindianaiowakansaskentuckymarylandmississippimissourinebraskanevadanew-jerseynew-mexiconorth-carolinaohiooklahomapennsylvaniasouth-carolinatennesseetexasutahvirginiawest-virginiawisconsin

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