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

Least Tern Population Trend in Oklahoma

All statesWetland birds

Least Tern in Oklahoma has surged: up 85% on the route-weighted index since 1992.

+85%Since 1992TrendPercent 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 →
12YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Least Tern Trends in OklahomaNotable 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 Least Tern in Oklahoma. See the full index history below.

Least Tern Survey Routes in Oklahoma

Routes recording Least Tern in Oklahoma.
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 →
Randlett320052003
Wainwright219921992
Jet120121995
Choctaw120032003
Eagle City119891989
Erick120051997
Cashion120062003
Tegarden119711971

Least Tern Population Trend in Other States

alabamaarkansascaliforniacoloradodelawarefloridageorgiaillinoiskansaskentuckylouisianamainemarylandmassachusettsmississippimissourinebraskanew-jerseynew-yorknorth-carolinasouth-carolinatennesseetexasvirginia

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