California (statewide) map of officially confirmed wildland confirmations of Phytophthora ramorum through December 2017 Map of confirmed counties with Sudden Oak Death caused by Phytophthora ramorum in Northern California

Links to updated (late 2019) county maps displaying known, confirmed trees infected by P. ramorum, based on SODMap (UC Berkeley, Garbelotto lab):

Alameda County Contra Costa County Humboldt County
Lake County Marin County Mendocino County
Monterey County Napa County San Francisco County
San Mateo County Santa Clara County Santa Cruz County
Solano County Sonoma County Trinity County

**Note that the maps provide a general idea of pathogen distribution in wildlands but not every record is displayed.

SODMAP includes P. ramorum reports confirmed by an official laboratory, including negative findings, with the intention of sharing known distribution information gathered by public agencies and research groups across the country.


The Oakmapper site provided a GIS tool which allowed users to learn about P. ramorum distribution in California. The online site was taken down in fall 2017 but the data files are available for download and use in your own GIS program. Download a zip file that contains the Officially Confirmed and Community Submitted shapefiles here.

Risk Maps

Video of projected Phytophthora ramorum spread in California from  Meentemeyer, R. K.; Cunniffe, N. J.; Cook, A.R.; Filipe, J.A. and others. 2011. Epidemiological modeling of invasion in heterogeneous landscapes: spread of sudden oak death in California (1990â??2030). Ecosphere. 2(2): 1-24.