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

Sora Population Trend in Iowa

All statesWetland birds

Sora in Iowa has held roughly steady: down 4% on the route-weighted index since 1969.

-4%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 →
8Routes 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 →
15YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Sora 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 Sora in Iowa. See the full index history below.

Sora Survey Routes in Iowa

Routes recording Sora 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 →
Scranton219931967
Titonka119681968
Exline119921992
Hudson119831979
Clare120192019
Pierson119691969
Sioux City120111971
Festina119751971

Sora Population Trend in Other States

alaskaarizonacaliforniacoloradoidahoillinoisindianakansasmainemassachusettsmichiganminnesotamontananebraskanevadanew-hampshirenew-mexiconew-yorknorth-dakotaohiooregonpennsylvaniasouth-dakotautahvermontwashingtonwisconsinwyoming

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