BirdAnalyst
Species · BCR 32 · BBS 2025 Release · 1966–2024

Vaux's Swift In Coastal California

All regionsCoastal CaliforniaAerial insectivores

Vaux's Swift in Coastal California has increased: up 34% on the route-weighted index since 1977.

+34%Since 1977
18Routes In Region
38Years

Notable Signals

No notable trend signals for Vaux's Swift in Coastal California. See the full index history below.

Forecast

If the recent trend holds, Vaux's Swift in Coastal California is projected to stay roughly flat through 2029, near 0.11 (95% range 0.00–0.24). A 5-year backtest shows a typical error of ±179.4%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2029
0.11Projected 2029 index
0.00–0.2495% range
±179.4%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
20250.100.000.23
20260.100.000.23
20270.110.000.24
20280.110.000.24
20290.110.000.24

Routes In Coastal California

Routes recording Vaux's Swift in Coastal California.
AdelaidaCALIFORNIA71977
Orange CoveCALIFORNIA62002
CoyoteCALIFORNIA52022
Red BluffCALIFORNIA42011
Lake SuccessCALIFORNIA41978
CopperopolisCALIFORNIA42017
Carmel ValCALIFORNIA22017
Waterman GapCALIFORNIA22024
Angelus OaksCALIFORNIA21989
Cal Hot SpgsCALIFORNIA22014
FairfaxCALIFORNIA11980
OnoCALIFORNIA12011
Mt BaldyCALIFORNIA12015
TehamaCALIFORNIA11996
LockwoodCALIFORNIA12023
Mark WestCALIFORNIA12017
Glen EllenCALIFORNIA11972
PescaderoCALIFORNIA12009

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