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

Vesper Sparrow Population Trend in Idaho

All statesGrassland birds

Vesper Sparrow in Idaho has surged: up 323% on the route-weighted index since 1970.

+323%Since 1970
50Routes In State
56Years

Notable Vesper Sparrow Trends in Idaho

long arc increasecomputed index

Vesper Sparrow has surged in Idaho: up 323% on the route-weighted index since 1970.

Vesper Sparrow Population Forecast in Idaho

If the recent trend holds, Vesper Sparrow in Idaho is projected to stay roughly flat through 2029, near 10 (95% range 3.1–18). A 5-year backtest shows a typical error of ±52.2%, with 100% of held-out values landing inside the 95% band.

-5%Change by 2029
10Projected 2029 index
3.1–1895% range
±52.2%Backtest error
19682029
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
2025103.018
2026103.018
2027103.018
2028103.018
2029103.118

Vesper Sparrow Survey Routes in Idaho

Routes recording Vesper Sparrow in Idaho.
Henry5919831976
Dubois5820241969
Sawtooth Cty4320141988
Daniels Res4120191988
Iron Springs3120241988
Sawtooth City 22820242015
Blackft Res2620181984
Triangle2620241985
Baker2220241974
Twin Buttes2120241989
Picabo1620211988
Cape Horn1520241972
Challis1320241976
Lost River1220241989
Carey1220181989
Craters1120181979
Dougal Res1020241988
Almo1020231988
Blacks Creek919891968
Tractor Flat920241985
Glenns Ferry819861986
Acequia820072002
Featherville820241990
Squirrel620241971
Gifford519731973

Vesper Sparrow Population Trend in Other States

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

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