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

White-crowned Sparrow In Northern Rockies

All regionsNorthern RockiesGeneralists

White-crowned Sparrow in Northern Rockies has edged up: up 12% on the route-weighted index since 1970.

+12%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 →
114Routes 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 →
56YearsYears 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 2029 — from 3.3 in 2024 to a central estimate of 2.9 (95% range 1.3–4.5). A 5-year backtest shows a typical error of ±35.8%, with 40% of held-out values landing inside the 95% band.

-14%Change by 2029TrendPercent 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 →
2.9Projected 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
1.3–4.595% 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 →
±35.8%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 2029 — from 3.3 in 2024 to a central estimate of 2.9 (95% range 1.3–4.5). A 5-year backtest shows a typical error of ±35.8%, with 40% of held-out values landing inside the 95% band.19682029
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 →
20252.81.24.4
20262.81.24.4
20272.81.24.4
20282.91.34.5
20292.91.34.5

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 RockMONTANA652024
YellowstoneWYOMING472022
Buckskin MtnWYOMING452021
Hebgen LakeMONTANA372024
ChestnutMONTANA332024
BeaverheadMONTANA332024
Soda LakeWYOMING322024
Big SandyWYOMING262024
Cape HornIDAHO252024
Hayden ValWYOMING241986
GoldenIDAHO232011
Bald MtnWYOMING222024
AlturasIDAHO191987
East Glacier ParkMONTANA192024
Colter Bay 2WYOMING182024
St. Mary 2MONTANA152024
Logan PassMONTANA152024
SulaMONTANA122024
SkalkahoMONTANA121998
Ne EntranceWYOMING122021
MooseWYOMING122024
Hunter PeakWYOMING112024
St MaryMONTANA102008
Sawtooth City 2IDAHO92024
MammothWYOMING92024

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