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

Field Sparrow Population Trend in Kansas

All statesGeneralists

Field Sparrow in Kansas has edged up: up 13% on the route-weighted index since 1969.

+13%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 →
57Routes 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 KansasNotable 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 Kansas. See the full index history below.

Field Sparrow Population Forecast in Kansas

If the recent trend holds, Field Sparrow in Kansas is projected to rise about 30% by 2029 — from 3.5 in 2024 to a central estimate of 4.6 (95% range 3.0–6.2). A 5-year backtest shows a typical error of ±10.9%, with 100% of held-out values landing inside the 95% band.

+30%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 →
4.6Projected 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 →
3.0–6.295% 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 →
±10.9%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 Kansas is projected to rise about 30% by 2029 — from 3.5 in 2024 to a central estimate of 4.6 (95% range 3.0–6.2). A 5-year backtest shows a typical error of ±10.9%, 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 →
20254.42.86.0
20264.52.96.1
20274.52.96.1
20284.52.96.2
20294.63.06.2

Field Sparrow Survey Routes in Kansas

Routes recording Field Sparrow in Kansas.
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 →
Grantville1920221967
Trading Post1920242000
Le Loup1720212000
Dover1120221967
Reece1120242000
Wreford1020241967
Humboldt820221968
St John820191982
Barclay820241967
Rock Creek820211968
Ash Valley820192000
Rock Creek 2820242022
Coats720241967
Coldwater720221971
Hollenberg620231971
Covert620241970
Hanover520231970
Bucyrus520242022
Longton520211976
Thrall419701967
Olathe420211967
Hodges420112003
Lincolnville420242002
Chapman319811977
Buckeye320231970

Field Sparrow Population Trend in Other States

alabamaarkansascoloradoconnecticutdelawarefloridageorgiaillinoisindianaiowakentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawest-virginiawisconsinwyoming

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