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

Black Swift Population Trend in Montana

All statesAerial insectivores

Black Swift in Montana has fallen sharply: down 62% on the route-weighted index since 1990.

-62%Since 1990TrendPercent 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 →
4Routes 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 Black Swift Trends in MontanaNotable 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 →

Black Swift has fallen sharply in Montana: down 62% on the route-weighted index since 1990.

Black Swift Survey Routes in Montana

Routes recording Black Swift in Montana.
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 →
St Regis619861986
Arlee219871987
Inside Road119901990
Logan Pass120131990

Black Swift Population Trend in Other States

alaskacaliforniacoloradoidahonew-mexicooregonutahwashington

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