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

Dickcissel Population Trend in Indiana

All statesGrassland birds

Dickcissel in Indiana has fallen sharply: down 56% on the route-weighted index since 1968.

-56%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 →
66Routes 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 IndianaNotable 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 declinecomputed 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 →

Dickcissel has fallen sharply in Indiana: down 56% on the route-weighted index since 1968.

Dickcissel Population Forecast in Indiana

If the recent trend holds, Dickcissel in Indiana is projected to rise about 46% by 2029 — from 5.2 in 2024 to a central estimate of 7.6 (95% range 0.86–14). A 5-year backtest shows a typical error of ±32.6%, with 100% of held-out values landing inside the 95% band.

+46%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 →
0.86–1495% 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 →
±32.6%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, Dickcissel in Indiana is projected to rise about 46% by 2029 — from 5.2 in 2024 to a central estimate of 7.6 (95% range 0.86–14). A 5-year backtest shows a typical error of ±32.6%, 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 →
20257.40.6614
20267.50.7114
20277.50.7614
20287.60.8114
20297.60.8614

Dickcissel Survey Routes in Indiana

Routes recording Dickcissel in Indiana.
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 →
Kankakee Sands6520242000
Newberry3220241999
Washington2520241987
Fowler1920241966
Wallace1820231999
Shelbyville1320241983
Cyprss1320241999
Thorntown1220241987
Brazil1120241966
Hebron1020221966
Millersburg1020241981
W Lafayette920241981
Jamestown920241986
Spencer820221967
New Brunswick820242024
Decatur820241999
Monticello620241981
Laporte620242000
Lakeville620232000
South Bend519741966
Packertown520041967
Ellis520221966
Evansville520221966
Witts Station520242000
Friendswood420231986

Dickcissel Population Trend in Other States

alabamaarkansascoloradodelawaregeorgiaillinoisiowakansaskentuckylouisianamarylandmichiganminnesotamississippimissourimontananebraskanew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniasouth-carolinasouth-dakotatennesseetexasvirginiawest-virginiawisconsinwyoming

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