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

Field Sparrow Population Trend in Nebraska

All statesGeneralists

Field Sparrow in Nebraska has surged: up 131% on the route-weighted index since 1969.

+131%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 →
62Routes 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 NebraskaNotable 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 increasecomputed 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 surged in Nebraska: up 131% on the route-weighted index since 1969.

Field Sparrow Population Forecast in Nebraska

If the recent trend holds, Field Sparrow in Nebraska is projected to rise about 80% by 2029 — from 3.9 in 2024 to a central estimate of 6.9 (95% range 4.3–9.6). A 5-year backtest shows a typical error of ±65.7%, with 40% of held-out values landing inside the 95% band.

+80%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 →
6.9Projected 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 →
4.3–9.695% 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 →
±65.7%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 Nebraska is projected to rise about 80% by 2029 — from 3.9 in 2024 to a central estimate of 6.9 (95% range 4.3–9.6). A 5-year backtest shows a typical error of ±65.7%, with 40% 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 →
20256.64.09.2
20266.74.19.3
20276.84.19.4
20286.94.29.5
20296.94.39.6

Field Sparrow Survey Routes in Nebraska

Routes recording Field Sparrow in Nebraska.
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 →
Brady4120241980
Winside3220031975
Sparta2420211967
Ponca1920242018
Winside 21520222005
Piester Lake1320151968
Nenzel1220242018
Murdock1220242018
Almeria1120211969
Johnson1020241967
Thurston1020241967
Midway1020231967
Madison1020192018
Humboldt1020242018
Swan Lake920231969
Tilden920242019
Hendley820242018
Wheeler Co820241978
Eagle Creek720241968
Johnstown720241980
Bartlett619761967
Petersburg620231969
Lyons620242018
Berwyn520101993
Julian420231969

Field Sparrow Population Trend in Other States

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

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