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

Field Sparrow Population Trend in Oklahoma

All statesGeneralists

Field Sparrow in Oklahoma has fallen sharply: down 64% on the route-weighted index since 1969.

-64%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 →
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 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 64% 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 2029, near 7.0 (95% range 1.6–12). A 5-year backtest shows a typical error of ±11.2%, with 100% of held-out values landing inside the 95% band.

+0%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 →
7.0Projected 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 →
1.6–1295% 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 →
±11.2%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 2029, near 7.0 (95% range 1.6–12). A 5-year backtest shows a typical error of ±11.2%, with 100% of held-out values landing inside the 95% band.19672029
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 →
20257.62.213
20267.42.113
20277.31.913
20287.11.813
20297.01.612

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 →
Phroso2920241991
Tatums2820241992
Holdenville2620241967
Barnsdall2619771967
Arapaho2420141998
Ardmore2320091967
Rosston2320181970
Grimes2220241967
Matoy2020001992
Cashion1920241992
Skiatook1820191982
Ft Sill West1719941994
Woodward1620241992
Bartlesville1420241967
Chester1319881967
Pocola1320161992
Wainwright1320131992
Verden1220171967
Phillips1120081968
Mill Creek1020181967
Colony919951995
Hollis920241993
Blanco820161967
Mcalester819911967
Noble820241967

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 2026-05-22.