All City of San Mateo Libraries will be closed on the following days:
2022
- Saturday, January 1: New Year's Holiday
- Monday, January 17: Martin Luther King, Jr. Holiday
- Monday, February 21: Presidents' Day Holiday
- Monday, May 30: Memorial Day Holiday
- Monday, July 4: Independence Day Holiday
- Monday, September 5: Labor Day Holiday
- Monday, October 10: Staff Development Day*
- Friday, November 11: Veterans Day Holiday
- Wednesday, November 23: Day before Thanksgiving - Closing at 5pm
- Thursday, November 24: Thanksgiving Holiday
- Friday, December 23: Christmas Eve Observance
- Saturday, December 24: Christmas Eve
- Sunday, December 25: Christmas Holiday
- Monday, December 26: Christmas Day Observance
2023
- Sunday, January 1: New Year's Day
- Monday, January 2: New Year's Day Observance
*Libraries will be closed for in-service training of Library employees.