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Species · Tennessee · BBS 2025 Release · 1966–2024

Dickcissel Population Trend in Tennessee

All statesGrassland birds

Dickcissel in Tennessee has edged down: down 24% on the route-weighted index since 1968.

-24%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 →
32Routes 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 Dickcissel Trends in TennesseeNotable 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 Dickcissel in Tennessee. See the full index history below.

Dickcissel Population Forecast in Tennessee

If the recent trend holds, Dickcissel in Tennessee is projected to rise about 210% by 2029 — from 1.3 in 2024 to a central estimate of 4.0 (95% range 1.6–6.3). A 5-year backtest shows a typical error of ±93.2%, with 80% of held-out values landing inside the 95% band.

+210%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 →
4.0Projected 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 →
1.6–6.395% 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 →
±93.2%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, Dickcissel in Tennessee is projected to rise about 210% by 2029 — from 1.3 in 2024 to a central estimate of 4.0 (95% range 1.6–6.3). A 5-year backtest shows a typical error of ±93.2%, 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 →
20253.91.56.3
20263.91.56.3
20273.91.56.3
20283.91.66.3
20294.01.66.3

Dickcissel Survey Routes in Tennessee

Routes recording Dickcissel in Tennessee.
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 →
Pawpaw5820121966
Pawpaw 22520232013
Bradyville1520211966
Tibbs1120241966
Tullahoma1020151967
Trenton820111968
Moscow420241967
Pond Creek319881988
Peytonsville320231995
Union Hill320241967
Glen320241966
Tiptonville220231966
Silerton220221966
Humboldt220241966
Collinwood220241970
Brownsville120241966
Whiteville120241966
Big Sandy120231975
Mansfield120241966
Sweetlips120221970
Indian Mound119961996
Wrigley120211985
Campbellsville120111967
Lewis Forest119991992
Belotes Bend120021966

Dickcissel Population Trend in Other States

alabamaarkansascoloradodelawaregeorgiaillinoisindianaiowakansaskentuckylouisianamarylandmichiganminnesotamississippimissourimontananebraskanew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniasouth-carolinasouth-dakotatexasvirginiawest-virginiawisconsinwyoming

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