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Species · Wyoming · BBS 2026 Release · 1966–2025

Cassin's Sparrow Population Trend in Wyoming

All statesGrassland birds

Cassin's Sparrow in Wyoming has edged up: up 23% on the route-weighted index since 2000.

+23%Since 2000TrendPercent 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 →
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 Cassin's Sparrow Trends in WyomingNotable 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 Cassin's Sparrow in Wyoming. See the full index history below.

Cassin's Sparrow Survey Routes in Wyoming

Routes recording Cassin's Sparrow in Wyoming.
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 →
Riverview320182018
Bucknum320242024
Shawnee220232018
Pine Bluff120242008
Lingle120141989
Yoder120252008

Cassin's Sparrow Population Trend in Other States

arizonaarkansascaliforniacoloradokansasnebraskanew-mexicooklahomatexas

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