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

Field Sparrow In Northern Rockies

All regionsNorthern RockiesGeneralists

Field Sparrow in Northern Rockies has declined: down 36% on the route-weighted index since 1990.

-36%Since 1990TrendPercent 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 →
9Routes 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 →
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 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 Field Sparrow in Northern Rockies. See the full index history below.

Routes In Northern Rockies

Routes recording Field Sparrow 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 →
HarmonyWYOMING111987
ClarkWYOMING32007
GlenMONTANA21985
PathfinderWYOMING22017
Muddy CreekMONTANA12015
OttoWYOMING12007
MidvaleWYOMING11991
EtheteWYOMING11993
RawlinsWYOMING11993

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