BirdAnalyst
Species · BCR 10 · BBS 2025 Release · 1966–2024

Tennessee Warbler In Northern Rockies

All regionsNorthern RockiesForest birds

Tennessee Warbler in Northern Rockies has edged up: up 20% on the route-weighted index since 1988.

+20%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 RegionSurvey 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 SignalsNotable 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 Northern Rockies. See the full index history below.

Routes In Northern Rockies

Routes recording Tennessee Warbler in Northern Rockies.
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 →
Whitefish LakeMONTANA32016
Logan PassMONTANA32016
Libby DamMONTANA21991
St. Mary 2MONTANA12016
Swan LakeMONTANA12017
Inside RoadMONTANA12019

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