BirdAnalyst
Species · BCR 16 · BBS 2025 Release · 1966–2024

Brown Thrasher In Southern Rockies / Colorado Plateau

All regionsSouthern Rockies / Colorado PlateauGeneralists

Brown Thrasher in Southern Rockies / Colorado Plateau has collapsed: down 80% on the route-weighted index since 1980.

-80%Since 1980TrendPercent 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 →
17YearsYears 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 Brown Thrasher in Southern Rockies / Colorado Plateau. See the full index history below.

Routes In Southern Rockies / Colorado Plateau

Routes recording Brown Thrasher in Southern Rockies / Colorado Plateau.
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 →
HarmonyCOLORADO12012
ParlinCOLORADO12016
GardnerCOLORADO12022
BrookhurstWYOMING12015
Fletcher PkWYOMING12002
Sybille CynWYOMING12014

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