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

Acorn Woodpecker In Coastal California

All regionsCoastal CaliforniaForest birds

Acorn Woodpecker in Coastal California has surged: up 88% on the route-weighted index since 1970.

+88%Since 1970
104Routes In Region
56Years

Notable Signals

long arc increasecomputed index

Acorn Woodpecker has surged in Coastal California: up 88% on the route-weighted index since 1970.

Forecast

If the recent trend holds, Acorn Woodpecker in Coastal California is projected to stay roughly flat through 2029, near 27 (95% range 20–35). A 5-year backtest shows a typical error of ±13%, with 100% of held-out values landing inside the 95% band.

+9%Change by 2029
27Projected 2029 index
20–3595% range
±13%Backtest error
19682029
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
2025271934
2026272034
2027272034
2028272034
2029272035

Routes In Coastal California

Routes recording Acorn Woodpecker in Coastal California.
Mt LagunaCALIFORNIA1111987
Yolla BollyCALIFORNIA902024
Red BluffCALIFORNIA872024
White RiverCALIFORNIA841992
LockwoodCALIFORNIA822024
Yokohl ValCALIFORNIA721997
FairfaxCALIFORNIA652024
Lake BerryessaCALIFORNIA622024
CoalingaCALIFORNIA602022
Orange CoveCALIFORNIA602016
Cal Hot SpgsCALIFORNIA602019
Waterman GapCALIFORNIA562024
TehamaCALIFORNIA522022
Lake HemetCALIFORNIA501986
ParkfieldCALIFORNIA492024
SangerCALIFORNIA482024
Santa YnezCALIFORNIA472019
AdelaidaCALIFORNIA472024
CoyoteCALIFORNIA462024
Cleveland Nf 2CALIFORNIA452022
OnoCALIFORNIA442012
Angelus OaksCALIFORNIA442017
OnealsCALIFORNIA412024
CohassetCALIFORNIA372024
SisquocCALIFORNIA372014

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