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

Hermit Warbler In Coastal California

All regionsCoastal CaliforniaForest birds

Hermit Warbler in Coastal California has surged: up 286% on the route-weighted index since 1973.

+286%Since 1973
23Routes In Region
52Years

Notable Signals

long arc increasecomputed index

Hermit Warbler has surged in Coastal California: up 286% on the route-weighted index since 1973.

Forecast

If the recent trend holds, Hermit Warbler in Coastal California is projected to rise about 315% by 2029 — from 0.09 in 2024 to a central estimate of 0.35 (95% range 0.06–0.65). A 5-year backtest shows a typical error of ±298.9%, with 0% of held-out values landing inside the 95% band.

+315%Change by 2029
0.35Projected 2029 index
0.06–0.6595% range
±298.9%Backtest error
19712029
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
20250.330.040.63
20260.340.040.63
20270.340.050.64
20280.350.050.64
20290.350.060.65

Routes In Coastal California

Routes recording Hermit Warbler in Coastal California.
Bartlett SpsCALIFORNIA52018
Waterman GapCALIFORNIA42024
TomheadCALIFORNIA32011
Hough SpringsCALIFORNIA32006
StonyfordCALIFORNIA32018
Point ReyesCALIFORNIA22022
CohassetCALIFORNIA21984
FairfaxCALIFORNIA22019
Glen EllenCALIFORNIA22003
Glen Ellen 2CALIFORNIA22018
CalpellaCALIFORNIA11986
Mt PinosCALIFORNIA11993
CoalingaCALIFORNIA11997
ValyermoCALIFORNIA12018
Lockwood ValCALIFORNIA11977
Elsinore MtnCALIFORNIA11973
Green ValleyCALIFORNIA12014
Lake CachumaCALIFORNIA12003
White RiverCALIFORNIA11973
TehamaCALIFORNIA12021
Angelus OaksCALIFORNIA12004
PescaderoCALIFORNIA12023
Cal Hot SpgsCALIFORNIA12015

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