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

Vesper Sparrow Population Trend in Oregon

All statesGrassland birds

Vesper Sparrow in Oregon has surged: up 89% on the route-weighted index since 1970.

+89%Since 1970
85Routes In State
56Years

Notable Vesper Sparrow Trends in Oregon

long arc increasecomputed index

Vesper Sparrow has surged in Oregon: up 89% on the route-weighted index since 1970.

Vesper Sparrow Population Forecast in Oregon

If the recent trend holds, Vesper Sparrow in Oregon is projected to stay roughly flat through 2029, near 6.6 (95% range 1.9–11). A 5-year backtest shows a typical error of ±11.2%, with 100% of held-out values landing inside the 95% band.

+6%Change by 2029
6.6Projected 2029 index
1.9–1195% range
±11.2%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
20256.51.811
20266.61.811
20276.61.811
20286.61.811
20296.61.911

Vesper Sparrow Survey Routes in Oregon

Routes recording Vesper Sparrow in Oregon.
Zumwalt12720051995
Blitzen 28020241994
Flook Lake5520241994
Buchanan5320241971
Princeton4519851976
Malheur Res.3620232022
Clover Creek3320241972
Sheaville3120242012
Blitzen2619931971
Catlow Rim2620241993
Crane2520241993
Lone Rock2420241968
Fish Lake2420241972
Madras2320241997
Bly2020011973
Joseph1920241971
Barnes Val1919871972
Bly 21920242007
Barnhouse1920241998
Green Mtn.1820241994
Crooked Riv.1320241994
Crowley1220241983
Battle Mtn1220241985
Eightmile1120241982
Silver Creek1120241984

Vesper Sparrow Population Trend in Other States

arizonacaliforniacoloradoconnecticutdelawareidahoillinoisindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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