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

Ovenbird Population Trend in Iowa

All statesForest birds

Ovenbird in Iowa has edged down: down 16% on the route-weighted index since 1973.

-16%Since 1973TrendPercent 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 →
10Routes 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 →
32YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Ovenbird Trends in IowaNotable 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 Ovenbird in Iowa. See the full index history below.

Ovenbird Population Forecast in Iowa

If the recent trend holds, Ovenbird in Iowa is projected to fall about 26% by 2022 — from 0.08 in 2017 to a central estimate of 0.06 (95% range 0.00–0.12). A 5-year backtest shows a typical error of ±29.5%, with 100% of held-out values landing inside the 95% band.

-26%Change by 2022TrendPercent 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 →
0.06Projected 2022 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.1295% 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 →
±29.5%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, Ovenbird in Iowa is projected to fall about 26% by 2022 — from 0.08 in 2017 to a central estimate of 0.06 (95% range 0.00–0.12). A 5-year backtest shows a typical error of ±29.5%, with 100% of held-out values landing inside the 95% band.19682022
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 →
20180.060.000.12
20190.060.000.12
20200.060.000.12
20210.060.000.12
20220.060.000.12

Ovenbird Survey Routes in Iowa

Routes recording Ovenbird in Iowa.
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 →
Mt Hamill220171972
Exline119841984
Cedar Valley119891968
Red Rock120072007
Washington119741974
Alice119721972
Pierson120092009
Washta119971997
Festina119931993
Garner119871987

Ovenbird Population Trend in Other States

alabamaarkansascoloradoconnecticutdelawaregeorgiaillinoisindianakansaskentuckymainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseeutahvermontvirginiawest-virginiawisconsinwyoming

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