(CBS SF) — School districts throughout the North Bay were canceling classes for additional days because of the wildfires in the region.

Calistoga Joint Unified School District, Saint Helena Unified School District and Napa Valley Unified School District have all canceled classes through the rest of this week because of the wildfires burning in Napa County since Sunday night, district officials said Tuesday.

Several wildfires are burning tens of thousands of acres in Napa and Sonoma counties, prompting widespread school closures.

Napa Valley Unified School District officials earlier said their schools will stay closed Wednesday and Thursday, then updated Tuesday afternoon that there will be no classes on Friday as well.

NVUSD officials were having trouble contacting staff so were also asking for all school principals at 3 p.m. Thursday to report to the district’s board room at 2425 Jefferson St. in Napa.

Kitchen managers and assistant managers were asked to report at 7 a.m. to the Food Service office, also at 2425 Jefferson St. in Napa, while M&O heads of shop and head custodians were asked to report at 7 a.m. Wednesday to 1616 Lincoln Ave. in Napa.

Napa Valley College will also be closed through the end of the week and its gym remains open as a shelter for evacuees from the fires.

Sonoma State University in Rohnert Park will not have classes or official university Wednesday because of the fires, although the Student Center remained open on the campus.

Updates on the university’s status later this week will be posted on its website.

Santa Rosa City Schools District and Cotati-Rohnert Park Unified School District schools will also be closed through Wednesday.

No determination has been made for either district on whether classes will resume later in the week.

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