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

Horned Lark Population Trend in Wisconsin

All statesGrassland birds

Horned Lark in Wisconsin has held roughly steady: down 8% on the route-weighted index since 1968.

-8%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 →
79Routes 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 Horned Lark Trends in WisconsinNotable 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 Horned Lark in Wisconsin. See the full index history below.

Horned Lark Population Forecast in Wisconsin

If the recent trend holds, Horned Lark in Wisconsin is projected to stay roughly flat through 2030, near 4.8 (95% range 2.2–7.4). A 5-year backtest shows a typical error of ±32.5%, with 100% of held-out values landing inside the 95% band.

+10%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 →
4.8Projected 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 →
2.2–7.495% 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 →
±32.5%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, Horned Lark in Wisconsin is projected to stay roughly flat through 2030, near 4.8 (95% range 2.2–7.4). A 5-year backtest shows a typical error of ±32.5%, 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 →
20264.82.27.4
20274.82.27.4
20284.82.27.4
20294.82.27.4
20304.82.27.4

Horned Lark Survey Routes in Wisconsin

Routes recording Horned Lark in Wisconsin.
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 →
Annaton5520251998
Raymond1920251966
Hudson1820251966
Grimms1820211998
Holland1820251998
Pt Washingtn1720241966
N Andover1520251967
River Falls1420251998
Gilmanton1320251966
Brownsville1220251966
Prairie Du Chien1220251998
Kiel1220251998
Viroqua1120241966
Pardeeville1120251967
Hazel Green1120251966
Paris1020251966
Loraine920251966
Stratford920251966
Casco920251967
Wiota920251966
Gresham920251998
N Freedom820251966
Hebron820251966
Rolling Grnd720231966
Beaver Dam720231966

Horned Lark Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawaregeorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawyoming

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