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

Bank Swallow Population Trend in California

All statesAerial insectivores

Bank Swallow in California has surged: up 505% on the route-weighted index since 1971.

+505%Since 1971
27Routes In State
54Years

Notable Bank Swallow Trends in California

long arc increasecomputed index

Bank Swallow has surged in California: up 505% on the route-weighted index since 1971.

Bank Swallow Population Forecast in California

If the recent trend holds, Bank Swallow in California is projected to rise about 15% by 2029 — from 0.20 in 2024 to a central estimate of 0.23 (95% range 0.00–1.2). A 5-year backtest shows a typical error of ±30.9%, with 100% of held-out values landing inside the 95% band.

+15%Change by 2029
0.23Projected 2029 index
0.00–1.295% range
±30.9%Backtest error
19692029
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
20250.280.001.2
20260.270.001.2
20270.260.001.2
20280.240.001.2
20290.230.001.2

Bank Swallow Survey Routes in California

Routes recording Bank Swallow in California.
Glenn11019971972
Jackson3119791979
Cedarville1320241977
Orland1019921992
Genesee620131995
Paxton520242000
Orleans520092009
Auburn419741974
Nubieber320071971
Hughson319841984
Elizabeth Lk219701970
Crowley Lake220212021
Parkfield219771971
Davis Creek219951995
Dorris220191972
Hay Fork220102010
Ingalls219921973
Adelaida219781972
Crescent Cty120242024
Red Bluff120212002
Pennington119911984
Fish Rock119691969
Likely119991972
Honey Lake120221972
Clear Lk Res119851985

Bank Swallow Population Trend in Other States

alabamaalaskaarkansascoloradoconnecticutdelawareidahoillinoisindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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