Schools were closed in Chaffey Unified , Etiwanda , Fontana Unified , Ontario-Montclair , and Alta Loma Unified .
On March 13 , schools were closed in Marin , Sacramento , San Joaquin , San Luis Obispo , Santa Clara , Solano , Placer , and Contra Costa counties , as well as the Oakland , Antioch , Santa Cruz , Los Angeles Unified , Chaffey Unified , Etiwanda , Fontana Unified , Ontario-Montclair , Alta Loma Unified , San Diego , Los Alamitos Unified , and Washington Unified school districts .
2020 coronavirus pandemic in California