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Species · Wisconsin · BBS 2025 Release · 1966–2024

Grasshopper Sparrow Population Trend in Wisconsin

All statesGrassland birds

Grasshopper Sparrow in Wisconsin has collapsed: down 96% on the route-weighted index since 1968.

-96%Since 1968
78Routes In State
58Years

Notable Grasshopper Sparrow Trends in Wisconsin

long arc declinecomputed index

Grasshopper Sparrow has collapsed in Wisconsin: down 96% on the route-weighted index since 1968.

Grasshopper Sparrow Population Forecast in Wisconsin

If the recent trend holds, Grasshopper Sparrow in Wisconsin is projected to fall about 100% by 2029 — from 0.16 in 2024 to a central estimate of 0.00 (95% range 0.00–1.0). A 5-year backtest shows a typical error of ±192%, with 100% of held-out values landing inside the 95% band.

-100%Change by 2029
0.00Projected 2029 index
0.00–1.095% range
±192%Backtest error
19662029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected index95% low95% high
20250.000.001.0
20260.000.001.0
20270.000.001.0
20280.000.001.0
20290.000.001.0

Grasshopper Sparrow Survey Routes in Wisconsin

Routes recording Grasshopper Sparrow in Wisconsin.
Cochrane1019871966
Rolling Pr619771966
Cumberland520031969
N Freedom520241966
Loraine420061966
Phillips320071966
Oconto Falls320091968
Rhinelander320092008
Meridean320241998
Iron River220231970
Weyerhauser220231966
Couderay219971969
Irma219701970
Clintonville220191967
Casco220081966
Eden219911976
Hazel Green220071966
Paris220011966
Stetsonville220182013
Buena Vista220241998
Chaffey119921992
Minong119831982
Shanagolden119741974
Montreal119841983
Hudson120151966

Grasshopper Sparrow Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniasouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawyoming

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