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

White-crowned Sparrow In Northern Rockies

All regionsNorthern RockiesForest birds

White-crowned Sparrow in Northern Rockies has edged up: up 24% on the route-weighted index since 1970.

+24%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 →
119Routes 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 White-crowned Sparrow in Northern Rockies. See the full index history below.

White-crowned Sparrow In Northern Rockies Population Forecast

If the recent trend holds, White-crowned Sparrow in Northern Rockies is projected to fall about 14% by 2030 — from 3.5 in 2025 to a central estimate of 3.0 (95% range 1.4–4.6). A 5-year backtest shows a typical error of ±31.5%, with 80% of held-out values landing inside the 95% band.

-14%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 →
3.0Projected 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 →
1.4–4.695% 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 →
±31.5%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, White-crowned Sparrow in Northern Rockies is projected to fall about 14% by 2030 — from 3.5 in 2025 to a central estimate of 3.0 (95% range 1.4–4.6). A 5-year backtest shows a typical error of ±31.5%, 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 →
20262.91.34.6
20273.01.34.6
20283.01.34.6
20293.01.44.6
20303.01.44.6

Routes In Northern Rockies

Routes recording White-crowned 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 →
Red RockMONTANA602025
Buckskin MtnWYOMING562025
YellowstoneWYOMING352025
Hebgen LakeMONTANA342025
BeaverheadMONTANA302025
Soda LakeWYOMING262025
Big SandyWYOMING262024
ChestnutMONTANA252025
Cape HornIDAHO242025
MammothWYOMING242025
Hayden ValWYOMING241986
GoldenIDAHO232011
East Glacier ParkMONTANA232025
Bald MtnWYOMING222025
Wise RiverMONTANA212025
AlturasIDAHO191987
Heart ButteMONTANA152025
Logan PassMONTANA142025
St. Mary 2MONTANA132025
Ne EntranceWYOMING132025
SulaMONTANA122024
SkalkahoMONTANA121998
Hunter PeakWYOMING122025
Colter Bay 2WYOMING122025
St MaryMONTANA102008

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