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

Chimney Swift Population Trend in Indiana

All statesAerial insectivores

Chimney Swift in Indiana has declined: down 43% on the route-weighted index since 1968.

-43%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 →
69Routes 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 →
59YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Chimney Swift 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 →

No notable trend signals for Chimney Swift in Indiana. See the full index history below.

Chimney Swift Population Forecast in Indiana

If the recent trend holds, Chimney Swift in Indiana is projected to stay roughly flat through 2030, near 5.6 (95% range 0.00–12). A 5-year backtest shows a typical error of ±54.9%, with 100% of held-out values landing inside the 95% band.

+2%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 →
5.6Projected 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 →
0.00–1295% 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 →
±54.9%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, Chimney Swift in Indiana is projected to stay roughly flat through 2030, near 5.6 (95% range 0.00–12). A 5-year backtest shows a typical error of ±54.9%, with 100% of held-out values landing inside the 95% band.19662030
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 →
20266.00.0012
20275.90.0012
20285.80.0012
20295.70.0012
20305.60.0012

Chimney Swift Survey Routes in Indiana

Routes recording Chimney Swift 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 →
Gary6019991980
Middletown2720251966
Indian Spgs1720251982
Plainfield1719991999
Muncie1619971981
Celestine1620251979
Packertown1520041967
Azalia1520251982
Maplewood1520212000
Evansville1420191966
Brookville1320251966
Wallace1320241999
Portage 21320252006
Georgia1220251999
Anderson1020252000
Monticello920251981
Galveston920251981
New Phila920251982
Hebron820251966
Witts Station820252000
Cyprss820251999
South Bend719901966
Spencer720241967
Knox620251981
Sexton620241981

Chimney Swift Population Trend in Other States

alabamaarkansascoloradoconnecticutdelawarefloridageorgiaillinoisiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawest-virginiawisconsinwyoming

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