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

Field Sparrow Population Trend in Ohio

All statesForest birds

Field Sparrow in Ohio has fallen sharply: down 64% on the route-weighted index since 1968.

-64%Since 1968TrendPercent 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 →
89Routes 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 →
59YearsYears 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 OhioNotable 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 Ohio: down 64% on the route-weighted index since 1968.

Field Sparrow Population Forecast in Ohio

If the recent trend holds, Field Sparrow in Ohio is projected to fall about 52% by 2030 — from 6.9 in 2025 to a central estimate of 3.3 (95% range 0.05–6.6). A 5-year backtest shows a typical error of ±25.4%, with 100% of held-out values landing inside the 95% band.

-52%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 →
3.3Projected 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 →
0.05–6.695% 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 →
±25.4%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 Ohio is projected to fall about 52% by 2030 — from 6.9 in 2025 to a central estimate of 3.3 (95% range 0.05–6.6). A 5-year backtest shows a typical error of ±25.4%, with 100% of held-out values landing inside the 95% band.19662030
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 →
20264.31.007.5
20274.00.767.3
20283.80.527.0
20293.50.296.8
20303.30.056.6

Field Sparrow Survey Routes in Ohio

Routes recording Field Sparrow in Ohio.
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 →
Coal Run4419921966
Harveysburg4319961966
Wilmington2519961966
Rome2320251966
Kings Creek2220151992
Marion1920231966
Hebron1820251966
Stonecreek1820251996
West Elkton1720121992
Omega1720241966
Lucerne1620251992
South Olive1620251993
Greasy Ridge1519911966
Ashley1520181988
Coshocton1519911990
Meadowbrook1420211966
Dresden1420251966
W Carrollton1420151989
Wayland1220171992
Westerville1219851966
Marion 21220252024
Kenton1120251966
Newcomerstwn1119951966
Adamsville1119891971
Bloomville920251992

Field Sparrow Population Trend in Other States

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

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