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Species · Montana · BBS 2025 Release · 1966–2024

Tennessee Warbler Population Trend in Montana

All statesForest birds

Tennessee Warbler in Montana has edged up: up 12% on the route-weighted index since 1988.

+12%Since 1988TrendPercent 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 →
6Routes 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 →
13YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Tennessee Warbler 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 →

No notable trend signals for Tennessee Warbler in Montana. See the full index history below.

Tennessee Warbler Survey Routes in Montana

Routes recording Tennessee Warbler 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 →
Logan Pass320162013
Whitefish Lake320162016
Libby Dam219911986
Inside Road120192011
St. Mary 2120162013
Swan Lake120172017

Tennessee Warbler Population Trend in Other States

alaskamainemichiganminnesotanew-hampshirenew-yorkpennsylvaniavermontwisconsin

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