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

Cassin's Kingbird In Coastal California

All regionsCoastal CaliforniaAerial insectivores

Cassin's Kingbird in Coastal California has surged: up 268% on the route-weighted index since 1971.

+268%Since 1971
36Routes In Region
54Years

Notable Signals

long arc increasecomputed index

Cassin's Kingbird has surged in Coastal California: up 268% on the route-weighted index since 1971.

Forecast

If the recent trend holds, Cassin's Kingbird in Coastal California is projected to fall about 59% by 2029 — from 2.1 in 2024 to a central estimate of 0.86 (95% range 0.20–1.5). A 5-year backtest shows a typical error of ±48.1%, with 40% of held-out values landing inside the 95% band.

-59%Change by 2029
0.86Projected 2029 index
0.20–1.595% range
±48.1%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
20250.800.151.5
20260.820.161.5
20270.830.171.5
20280.850.191.5
20290.860.201.5

Routes In Coastal California

Routes recording Cassin's Kingbird in Coastal California.
MorenoCALIFORNIA262024
Oak GroveCALIFORNIA182024
Jofegan 2CALIFORNIA172024
Elsinore MtnCALIFORNIA112024
Hollister 2CALIFORNIA112024
San YsidroCALIFORNIA102019
Elizabeth LkCALIFORNIA92016
CrestonCALIFORNIA81983
Santa YnezCALIFORNIA62019
AnzaCALIFORNIA61981
Harbor Lake 2CALIFORNIA62024
Cp. PendletonCALIFORNIA52004
Foster ParkCALIFORNIA41981
Mt PinosCALIFORNIA41969
SisquocCALIFORNIA42014
JacumbaCALIFORNIA42024
WoodlandsCALIFORNIA32016
Tres PinosCALIFORNIA21977
Mesa GrandeCALIFORNIA22024
Cuyamaca PkCALIFORNIA22023
AdelaidaCALIFORNIA22024
Green ValleyCALIFORNIA22016
LockwoodCALIFORNIA22004
JofeganCALIFORNIA22023
ParkfieldCALIFORNIA12014

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