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Species · BCR 19 · BBS 2026 Release · 1966–2025

Field Sparrow In Central Mixed Grass Prairie

All regionsCentral Mixed Grass PrairieForest birds

Field Sparrow in Central Mixed Grass Prairie has held roughly steady: up 6% on the route-weighted index since 1969.

+6%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 →
112Routes 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 →
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 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 Field Sparrow in Central Mixed Grass Prairie. See the full index history below.

Field Sparrow In Central Mixed Grass Prairie Population Forecast

If the recent trend holds, Field Sparrow in Central Mixed Grass Prairie is projected to rise about 41% by 2030 — from 3.3 in 2025 to a central estimate of 4.6 (95% range 2.7–6.6). A 5-year backtest shows a typical error of ±17.3%, with 100% of held-out values landing inside the 95% band.

+41%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 →
4.6Projected 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 →
2.7–6.695% 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 →
±17.3%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 Central Mixed Grass Prairie is projected to rise about 41% by 2030 — from 3.3 in 2025 to a central estimate of 4.6 (95% range 2.7–6.6). A 5-year backtest shows a typical error of ±17.3%, 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 →
20264.52.56.5
20274.52.56.5
20284.62.66.5
20294.62.66.6
20304.62.76.6

Routes In Central Mixed Grass Prairie

Routes recording Field Sparrow in Central Mixed Grass Prairie.
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 →
BradyNEBRASKA602025
GrimesOKLAHOMA302025
ArapahoOKLAHOMA242014
PhrosoOKLAHOMA242025
RosstonOKLAHOMA232018
WoodwardOKLAHOMA222025
CashionOKLAHOMA192024
Ft Sill WestOKLAHOMA171994
EldoradoTEXAS142023
Piester LakeNEBRASKA132015
ChesterOKLAHOMA131988
ClarendonTEXAS132024
VerdenOKLAHOMA122017
AlmeriaNEBRASKA112021
ChambersNEBRASKA112025
HendleyNEBRASKA112025
LookoutOKLAHOMA102025
HollisOKLAHOMA92024
ColonyOKLAHOMA91995
St JohnKANSAS82019
Ash ValleyKANSAS82019
ElginOKLAHOMA82016
ColdwaterKANSAS72022
Wheeler CoNEBRASKA72025
Wichita MtnsOKLAHOMA71994

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