BirdAnalyst
Species · Oregon · BBS 2026 Release · 1966–2025

White-crowned Sparrow Population Trend in Oregon

All statesForest birds

White-crowned Sparrow in Oregon has declined: down 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 →
77Routes 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 →
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 White-crowned Sparrow Trends in OregonNotable 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 Oregon. See the full index history below.

White-crowned Sparrow Population Forecast in Oregon

If the recent trend holds, White-crowned Sparrow in Oregon is projected to fall about 13% by 2030 — from 3.7 in 2025 to a central estimate of 3.2 (95% range 0.90–5.5). A 5-year backtest shows a typical error of ±26.7%, with 80% of held-out values landing inside the 95% band.

-13%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 →
3.2Projected 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 →
0.90–5.595% 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 →
±26.7%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 Oregon is projected to fall about 13% by 2030 — from 3.7 in 2025 to a central estimate of 3.2 (95% range 0.90–5.5). A 5-year backtest shows a typical error of ±26.7%, 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 →
20263.31.05.6
20273.30.975.6
20283.20.955.5
20293.20.925.5
20303.20.905.5

White-crowned Sparrow Survey Routes in Oregon

Routes recording White-crowned Sparrow in Oregon.
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 →
Hazel Camp6120221975
Canby3620251993
Coquille3520251994
Garfield3020251973
Wedderburn2820251970
Hauser2519851970
Scio2520251971
Svensen2219921990
Glasgow2220251986
Dayton2020251974
Salem1920251993
Molalla1520251994
Mt Hood1420251972
Salado1320251968
Mcminnville1220251994
Harlan 21220252011
Scappoose1120251995
Fish Lake920251972
Sandy River920061993
Santiam920251994
Timber820171968
Lobster Creek820252025
Fisher820101997
Ordnance719731971
Trask Summit720241992

White-crowned Sparrow Population Trend in Other States

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