BirdAnalyst
Species · Oregon · BBS 2025 Release · 1966–2024

White-crowned Sparrow Population Trend in Oregon

All statesGeneralists

White-crowned Sparrow in Oregon has declined: down 45% on the route-weighted index since 1970.

-45%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 →
75Routes 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 →
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 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 stay roughly flat through 2029, near 3.2 (95% range 0.88–5.5). A 5-year backtest shows a typical error of ±33.8%, with 80% of held-out values landing inside the 95% band.

-1%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 →
3.2Projected 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 →
0.88–5.595% 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 →
±33.8%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 Oregon is projected to stay roughly flat through 2029, near 3.2 (95% range 0.88–5.5). A 5-year backtest shows a typical error of ±33.8%, with 80% 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 →
20253.30.985.6
20263.30.965.6
20273.20.935.6
20283.20.915.5
20293.20.885.5

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
Coquille3120241994
Dayton2620241974
Hauser2519851970
Garfield2520231973
Salado2420241968
Wedderburn2220241970
Svensen2219921990
Scio2020241971
Glasgow1920241986
Salem1520241993
Harlan 21420242011
Molalla1220241994
Adair1220241971
Canby1220241993
Santiam1020241994
Mcminnville1020241994
Sandy River920061993
Timber820171968
Scappoose820231995
Fisher820101997
Lorane820241993
Ordnance719731971
Mt Hood720241972
Trask Summit720241992

White-crowned Sparrow Population Trend in Other States

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