BirdAnalyst
Species · BCR 10 · BBS 2026 Release · 1966–2025

House Sparrow In Northern Rockies

All regionsNorthern RockiesGeneralists

House Sparrow in Northern Rockies has increased: up 48% on the route-weighted index since 1970.

+48%Since 1970TrendPercent 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 →
109Routes 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 →
57YearsYears 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 House Sparrow in Northern Rockies. See the full index history below.

House Sparrow In Northern Rockies Population Forecast

If the recent trend holds, House Sparrow in Northern Rockies is projected to fall about 37% by 2030 — from 6.4 in 2025 to a central estimate of 4.0 (95% range 0.62–7.4). A 5-year backtest shows a typical error of ±45.4%, with 80% of held-out values landing inside the 95% band.

-37%Change by 2030TrendPercent 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 →
4.0Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.62–7.495% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±45.4%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, House Sparrow in Northern Rockies is projected to fall about 37% by 2030 — from 6.4 in 2025 to a central estimate of 4.0 (95% range 0.62–7.4). A 5-year backtest shows a typical error of ±45.4%, with 80% of held-out values landing inside the 95% band.19682030
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
20264.10.667.5
20274.10.657.5
20284.10.647.5
20294.00.637.5
20304.00.627.4

Routes In Northern Rockies

Routes recording House 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 →
Pablo Res.MONTANA2742025
VictorMONTANA652025
MidvaleWYOMING622025
FrannieWYOMING442025
SpartaOREGON402025
KalispellMONTANA382025
AlturasIDAHO341968
Threemile WaMONTANA332025
TensleepWYOMING312025
Elk HornWYOMING302018
HarmonyWYOMING272025
Church HillMONTANA262025
Willow CreekMONTANA251981
WorlandWYOMING252025
BoulderMONTANA222025
EtheteWYOMING202025
LayCOLORADO192025
PolsonMONTANA192025
Twin BridgesMONTANA191976
MeeteetseWYOMING182025
Carter 2WYOMING172025
MaybellCOLORADO162025
RelianceWYOMING152025
Rock Springs 2WYOMING152025
CodyWYOMING142025

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