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

Vesper Sparrow Population Trend in Indiana

All statesGrassland birds

Vesper Sparrow in Indiana has collapsed: down 88% on the route-weighted index since 1968.

-88%Since 1968
58Routes In State
58Years

Notable Vesper Sparrow Trends in Indiana

long arc declinecomputed index

Vesper Sparrow has collapsed in Indiana: down 88% on the route-weighted index since 1968.

Vesper Sparrow Population Forecast in Indiana

If the recent trend holds, Vesper Sparrow in Indiana is projected to stay roughly flat through 2029, near 1.2 (95% range 0.00–5.2). A 5-year backtest shows a typical error of ±62.8%, with 100% of held-out values landing inside the 95% band.

+3%Change by 2029
1.2Projected 2029 index
0.00–5.295% range
±62.8%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
20251.80.005.8
20261.70.005.7
20271.50.005.5
20281.40.005.3
20291.20.005.2

Vesper Sparrow Survey Routes in Indiana

Routes recording Vesper Sparrow in Indiana.
Kewanna2220221981
Sexton1820161983
Monticello1320241981
Packertown1119931967
W Lafayette1020241981
Tipton819921966
Maplewood820212017
Laporte820231999
Galveston520241981
Hebron420221966
Fowler420241966
Brazil420171966
Frankfort420221999
Jamestown320241986
Spencer320211970
Montpelier320242018
Decatur320192002
Portage 2320222015
Portage320002000
Lakeville320242011
Columbia Cty220241981
Thorntown220241982
Wabash220241983
Berne220241966
Cumback220041966

Vesper Sparrow Population Trend in Other States

arizonacaliforniacoloradoconnecticutdelawareidahoillinoisiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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