BirdAnalyst
Species · North Dakota · BBS 2026 Release · 1966–2025

Field Sparrow Population Trend in North Dakota

All statesForest birds

Field Sparrow in North Dakota has edged down: down 17% on the route-weighted index since 1969.

-17%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 →
27Routes 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 →
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 Field Sparrow Trends in North DakotaNotable 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 North Dakota. See the full index history below.

Field Sparrow Population Forecast in North Dakota

If the recent trend holds, Field Sparrow in North Dakota is projected to rise about 25% by 2030 — from 1.3 in 2025 to a central estimate of 1.6 (95% range 0.00–3.2). A 5-year backtest shows a typical error of ±407.1%, with 20% of held-out values landing inside the 95% band.

+25%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 →
1.6Projected 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 →
0.00–3.295% 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 →
±407.1%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 North Dakota is projected to rise about 25% by 2030 — from 1.3 in 2025 to a central estimate of 1.6 (95% range 0.00–3.2). A 5-year backtest shows a typical error of ±407.1%, with 20% 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 →
20261.60.003.2
20271.60.003.2
20281.60.003.2
20291.60.003.2
20301.60.003.2

Field Sparrow Survey Routes in North Dakota

Routes recording Field Sparrow in North Dakota.
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 →
Roosevelt Pk2720191982
Gorham1220251968
Tobacco1120191968
Ft Yates1020041970
Solen620252005
Regan520251968
Parshall520082004
Dunn Center420251968
Stanley420251967
Dickinson319931974
Zap320191968
Golva320251980
Turtle Mtns319881986
Bentley220181988
Walcott120012001
Sydney119671967
Lake George120152015
Danzig120032003
Cooperstown120101970
Wimbledon120172017
Buchanan120171988
Rolla120031982
Carpio119961970
Loraine120112011
Lark119811968

Field Sparrow Population Trend in Other States

alabamaarkansascoloradoconnecticutdelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanew-hampshirenew-jerseynew-yorknorth-carolinaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawest-virginiawisconsinwyoming

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