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Species · California · BBS 2025 Release · 1966–2024

Grasshopper Sparrow Population Trend in California

All statesGrassland birds

Grasshopper Sparrow in California has surged: up 197% on the route-weighted index since 1974.

+197%Since 1974
61Routes In State
52Years

Notable Grasshopper Sparrow Trends in California

long arc increasecomputed index

Grasshopper Sparrow has surged in California: up 197% on the route-weighted index since 1974.

Grasshopper Sparrow Population Forecast in California

If the recent trend holds, Grasshopper Sparrow in California is projected to stay roughly flat through 2029, near 0.22 (95% range 0.00–0.51). A 5-year backtest shows a typical error of ±787.5%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2029
0.22Projected 2029 index
0.00–0.5195% range
±787.5%Backtest error
19722029
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
20250.220.000.51
20260.220.000.51
20270.220.000.51
20280.220.000.51
20290.220.000.51

Grasshopper Sparrow Survey Routes in California

Routes recording Grasshopper Sparrow in California.
Alderpoint1620121985
Jofegan1020232006
Mt Shasta719761975
Anza619951995
Rio Dell520071981
Cp. Pendleton520041986
Holmes320081992
Red Bluff320222012
Ventucopa319991994
Carrizo Pln320031995
Riovista320142014
Tres Pinos320021974
Laytonville320121974
Martins Fy320081977
Carmel Val320221984
Honeydew220171991
Santa Cruz I219881988
Creston220081983
Jofegan 2220242024
Crowley Lake219771972
Jackson219791979
Cedarville219821982
Hollister219911986
Morro Bay220131979
Tres Pinos 2220112006

Grasshopper Sparrow Population Trend in Other States

alabamaarizonaarkansascoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniasouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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