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

Field Sparrow Population Trend in Oklahoma

All statesForest birds

Field Sparrow in Oklahoma has fallen sharply: down 65% on the route-weighted index since 1969.

-65%Since 1969TrendPercent 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 →
67Routes 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 →
58YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Field Sparrow Trends in OklahomaNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

long arc declinecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Field Sparrow has fallen sharply in Oklahoma: down 65% on the route-weighted index since 1969.

Field Sparrow Population Forecast in Oklahoma

If the recent trend holds, Field Sparrow in Oklahoma is projected to stay roughly flat through 2030, near 6.8 (95% range 1.5–12). A 5-year backtest shows a typical error of ±13.5%, with 100% of held-out values landing inside the 95% band.

+5%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 →
6.8Projected 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 →
1.5–1295% 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 →
±13.5%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, Field Sparrow in Oklahoma is projected to stay roughly flat through 2030, near 6.8 (95% range 1.5–12). A 5-year backtest shows a typical error of ±13.5%, with 100% of held-out values landing inside the 95% band.19672030
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 →
20267.32.013
20277.21.913
20287.11.712
20296.91.612
20306.81.512

Field Sparrow Survey Routes in Oklahoma

Routes recording Field Sparrow in Oklahoma.
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 →
Grimes3020251967
Barnsdall2619771967
Phroso2420251991
Arapaho2420141998
Holdenville2320251967
Rosston2320181970
Woodward2220251992
Matoy2020001992
Cashion1920241992
Bartlesville1820251967
Skiatook1820191982
Ft Sill West1719941994
Chester1319881967
Pocola1320161992
Wainwright1320131992
Verden1220171967
Phillips1120081968
Tatums1120251992
Lookout1020251968
Colony919951995
Hollis920241993
Blanco820161967
Mcalester819911967
Elgin820161994
Heyburn820251992

Field Sparrow Population Trend in Other States

alabamaarkansascoloradoconnecticutdelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiopennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawest-virginiawisconsinwyoming

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