BirdAnalyst
Species · Louisiana · BBS 2026 Release · 1966–2025

Summer Tanager Population Trend in Louisiana

All statesForest birds

Summer Tanager in Louisiana has increased: up 37% on the route-weighted index since 1969.

+37%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 →
85Routes 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 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 25% by 2030 — from 6.9 in 2025 to a central estimate of 5.2 (95% range 3.1–7.3). A 5-year backtest shows a typical error of ±26.8%, with 80% of held-out values landing inside the 95% band.

-25%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 →
5.2Projected 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 →
3.1–7.395% 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 →
±26.8%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 25% by 2030 — from 6.9 in 2025 to a central estimate of 5.2 (95% range 3.1–7.3). A 5-year backtest shows a typical error of ±26.8%, with 80% of held-out values landing inside the 95% band.19672030
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 →
20265.23.17.3
20275.23.17.3
20285.23.17.3
20295.23.17.3
20305.23.17.3

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 →
Norwood2720252004
Atchafalaya2720251989
Ivan 22120252014
Natchez1920251992
Longstreet1620251967
Goodwill1620252004
Derry1519891967
Tensas Nwr1520251987
Easton1419901967
Haughton1320251990
Linville1220251998
Ivan1220131998
Marion1119961988
Evelyn1120242004
Bickham1020251984
Fillmore1019891968
Many1019921989
Mount Union1020251998
Plettenberg920221968
Womack920251999
Oakdale919941991
Hargis 2920142013
Shaw820241967
Mer Rouge820081967
Carterville819921992

Summer Tanager Population Trend in Other States

alabamaarizonaarkansascaliforniadelawarefloridageorgiaillinoisindianaiowakansaskentuckymarylandmississippimissourinebraskanevadanew-jerseynew-mexiconorth-carolinaohiooklahomapennsylvaniasouth-carolinatennesseetexasutahvirginiawest-virginiawisconsin

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