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

Spruce Grouse Population Trend in Idaho

All statesGeneralists

Spruce Grouse in Idaho has surged: up 88% on the route-weighted index since 2003.

+88%Since 2003TrendPercent 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 →
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 Spruce Grouse Trends in IdahoNotable 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 Spruce Grouse in Idaho. See the full index history below.

Spruce Grouse Survey Routes in Idaho

Routes recording Spruce Grouse in Idaho.
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 →
Burgdorf120152003
Mivoden119891989
Yellow Pine120162002
Lolo Pass120122009

Spruce Grouse Population Trend in Other States

alaskamainemichiganminnesotamontananew-yorkwashington

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