All City of San Mateo Libraries will be closed on the following days:
2020
- Wednesday, January 1: New Year's Day Holiday
- Monday, January 20: Martin Luther King, Jr. Holiday
- Monday, February 17: Presidents' Day Holiday
- Monday, May 25: Memorial Day Holiday
- Friday, July 3: Independence Day Holiday (observed)
- Saturday, July 4: Independence Day Holiday
- Monday, September 7: Labor Day Holiday
- Monday, October 12: Staff Development Day*
- Wednesday, November 11: Veterans Day Holiday
- Wednesday, November 25: Day before Thanksgiving - Closing at 5pm
- Thursday, November 26: Thanksgiving Holiday
- Thursday, December 24: Christmas Eve
- Friday, December 25: Christmas Holiday
- Thursday, December 31: New Year's Eve - Closing at 5pm
*Libraries will be closed for in-service training of Library employees.