San Mateo County California Schools Calendar

About 90,000 students attend public schools in San Mateo County, California, a Peninsula county between San Francisco and Silicon Valley where roughly 20 school districts, from the large Sequoia Union High School District and its feeder elementary systems to the coastal Cabrillo Unified, each adopt their own calendars. There is no countywide schedule, and a family in Daly City, one in Redwood City, and one in Pescadero can share a county without sharing a first day of school, a spring break, or an enrollment process.

School District Structure in San Mateo County

San Mateo County is a county in the legal sense, with Redwood City as its county seat, but its schools are run by locally elected governing boards rather than by the county. The San Mateo County Superintendent of Schools leads the San Mateo County Office of Education (SMCOE), overseen by the elected San Mateo County Board of Education. SMCOE provides special education services, court and community schools, fiscal oversight, and training for districts, but it does not set local calendars.

The county uses a mix of structures. Unified districts, which serve kindergarten through twelfth grade, include Jefferson Union High School District’s neighbors in some areas, as well as Cabrillo Unified (Half Moon Bay and Pescadero), La Honda-Pescadero Unified, San Mateo-Foster City (an elementary district), and Redwood City Elementary. In the north, the Jefferson Union High School District draws from the Jefferson Elementary, Brisbane, Bayshore, and South San Francisco Unified areas, while Daly City has its own elementary system. Along the central Peninsula, the San Mateo Union High School District is fed by San Mateo-Foster City, Burlingame, Hillsborough, Belmont-Redwood Shores, and San Carlos elementary districts. The Sequoia Union High School District serves the southern county and draws from Redwood City, Menlo Park’s Ravenswood City and Menlo Park City, Woodside, Las Lomitas, and Portola Valley elementary districts.

Because so many districts split elementary and high school responsibilities, many households follow two calendars. Boards generally meet once or twice a month, usually in the evening, with agendas posted in advance. The county is largely urban and suburban, with dense cities on the bayside and a rural, agricultural coast, so transportation and calendar needs differ across the Santa Cruz Mountains.

Academic Calendar Structure

Most San Mateo County districts start in mid-to-late August and end in late May or early June, though exact dates vary by district and year. Boards usually adopt the next year’s calendar in winter or spring, and some adopt two years at once, so district websites may show dates well ahead.

High schools use two semesters, with finals either before winter break or in January depending on the district. Elementary schools commonly report progress by trimester, though some use semesters. Check your district’s grading calendar for precise end dates.

California requires 180 instructional days and sets minimum instructional minutes by grade level: 36,000 for kindergarten, 50,400 for grades one through three, 54,000 for grades four through eight, and 64,800 for grades nine through twelve. San Mateo County districts meet those totals through full-length days, with minimum days mixed in for conferences and grading periods.

Elementary bell times in San Mateo, Redwood City, and Daly City generally fall between about 8:00 and 8:30 a.m. at the start and end in early-to-mid afternoon. State law bars middle schools from starting before 8:00 a.m. and high schools before 8:30 a.m., with limited exceptions such as optional zero periods. Confirm bell schedules on each campus’s page.

School Holidays and Breaks

Standard closures on San Mateo County district calendars usually include:

• Labor Day in early September
• Veterans Day on or near November 11
• Thanksgiving break, often a full week or most of it
• Winter break of about two weeks around Christmas and New Year’s Day
• Martin Luther King Jr. Day in January
• Presidents’ Day, sometimes with a February break
• Spring break, typically one week in late March or April
• Memorial Day in late May

Fall break of the Tennessee type is not standard. Some districts observe Cesar Chavez Day on March 31 and Lunar New Year in some years, reflecting the county’s large Latino and Asian American communities, and spring break may or may not be tied to Easter. Holidays shift each year, so the adopted calendar is the only reliable source.

How to Find the Official San Mateo County School Calendar

Because no countywide calendar exists, begin by identifying the district that serves your address. SMCOE’s website lists the county’s districts and links to each, which helps if you are new to the area or live near a boundary. Then visit the district site, such as Sequoia Union High School District, San Mateo Union High School District, or Redwood City School District, and look under “Calendar,” “District,” “Parents,” “Families,” or “Community.” Board-adopted calendars are typically posted as PDFs, and many districts offer a feed you can add to a phone or email calendar.

Calendars are approved at a public board meeting, with the agenda packet posted ahead of time, so you can see proposed dates before the vote. Individual schools keep supplemental calendars for back-to-school nights, concerts, picture days, field trips, and assemblies, and athletic schedules typically live on separate pages.

Families relocating along the Central Coast and Bay Area often want to compare how calendars work from one county to the next. If you are curious how a coastal county of college towns and wine country handles it, you can read about the San Luis Obispo County schools calendar, or return to the San Mateo County schools calendar overview here for Peninsula details.

Early Release Days, Teacher Workdays, and Professional Development

Teachers in San Mateo County typically report several days before students return in August for planning and training. During the year, pupil-free days are scheduled for professional development, grading, and parent conferences, often near the end of a semester or trimester.

Minimum days and early release days are common in elementary schools, particularly around grading periods, conferences, and holidays. Many families commute along US-101, I-280, or Caltrain to jobs in San Francisco and Silicon Valley, so early release days can strain child care, and families should plan ahead. Districts announce these through the annual calendar, school newsletters, and notification platforms by text, email, and phone, often in English and Spanish, with additional languages in some districts.

California requires certain staff training, including mandated reporter training, but does not set a fixed number of pupil-free days. Each district negotiates those days locally with its teachers’ association.

Emergency Closures and Weather Days

Snow does not affect San Mateo County schools, so the main disruptors are winter storms, flooding, wildfire smoke, power outages, extreme heat events, and earthquakes. The county sits along the San Andreas Fault, and strong shaking can prompt campus inspections and short closures. Atmospheric river storms can flood creeks and roads, particularly in the low-lying bayside areas, and coastal communities such as Half Moon Bay and Pescadero are also exposed to landslides, road closures, and tsunami warnings. Wildfire smoke from regional fires has pushed air quality into unhealthy ranges and led to indoor days and closures in recent fall seasons, and the redwood and forested areas of the Santa Cruz Mountains carry wildfire risk.

Closure decisions rest with the district superintendent, typically after consulting transportation staff and local emergency officials. Notices go out through the district’s automated call, text, and email system, the district website, and social media. Local outlets include the San Mateo Daily Journal, the Half Moon Bay Review, The Mercury News, the San Francisco Chronicle, KRON 4, KTVU Fox 2, KPIX CBS 5, ABC7 News, and NBC Bay Area, along with Spanish- and Chinese-language outlets.

California does not require districts to make up every closure day as some states do, but districts must meet instructional day and minute requirements to receive full state funding. Significant closures may lead a district to request a waiver from the California Department of Education. Ask your district how makeup time is handled.

Graduation and End-of-Year Schedule

High school finals usually fall in the last week or two before winter break or in January, and again in late May or early June, depending on the district’s semester structure. Graduations are generally held in late May or early June, with many high schools using their own stadiums or gyms and others using larger local venues or college campuses.

Elementary and middle schools hold promotion or moving-up ceremonies in the final week or so. Report cards are issued by trimester or semester, and families can usually check grades through a student information portal. If you do not have login credentials, contact the school office.

Back-to-School and Registration Information

Enrollment for the coming year commonly opens in the spring, often through an online process for returning students and a separate one for new families. Districts must enroll students who live within their boundaries, and many San Mateo County districts accept interdistrict transfer requests when space is available. Housing costs and competitive demand mean some campuses fill quickly, so apply early.

Typical documents include proof of residency, a birth certificate or other proof of age, and immunization records. California does not permit personal belief exemptions, so check requirements with the school nurse or district office. Registration is generally online, with in-person help at district offices or school front desks.

Supply lists are usually posted in late summer on school websites. Orientations, open houses, and back-to-school nights tend to appear in the first weeks of the year. Transitional kindergarten is available to all four-year-olds statewide and generally follows the elementary calendar.

Special Programs and Their Calendar Implications

Several programs in the county may run on different schedules. Charter and specialty schools, including language immersion programs, set their own calendars, though many follow their sponsoring district’s major holidays. Alternative and continuation programs, along with SMCOE’s court, community, and special education schools, may have different start dates or session lengths.

Dual enrollment and early college students need to follow two calendars. The San Mateo County Community College District, which includes Skyline College, College of San Mateo, and Cañada College, runs on a college schedule whose finals and breaks do not always match local high school dates. Preschool and early childhood programs, including state preschool and Head Start, may follow different calendars from the K-12 districts. Independent study and virtual options are offered by several districts and charters, and each sets its own calendar, so confirm dates directly with the program.

Year-round calendars are uncommon in the county today, with traditional calendars dominating.

Athletics and Extracurricular Calendar Context

High school athletics in San Mateo County fall under the California Interscholastic Federation, Central Coast Section (CIF-CCS), which sets season dates, eligibility rules, and playoff schedules. Local schools compete in leagues within that structure, such as the Peninsula Athletic League. Fall, winter, and spring sports do not always match the academic calendar, so football playoffs, basketball tournaments, and spring competitions can overlap with holidays and exam weeks. Teams sometimes practice during breaks. Storms and smoke can postpone events, and coastal schools may face long travel times to bayside opponents. Each school’s athletics page posts schedules separate from the academic calendar.

State-Level Calendar Requirements and How California Law Governs San Mateo County

The California Department of Education sets the framework. State law requires 180 instructional days and specifies minimum instructional minutes by grade level, but leaves districts wide latitude over start and end dates, break timing, and the mix of regular, minimum, and pupil-free days. State law also limits how early middle and high schools may begin, and employee bargaining agreements shape staff development days and early release schedules.

San Mateo County districts are funded based on attendance, or in some basic-aid districts primarily by local property taxes, and must stay in compliance with instructional requirements. The California Department of Education publishes guidance on waivers, minimum days, and emergency closures. Because the state leaves so much to local boards, a neighboring district’s calendar tells you little about your own.

Frequently Asked Questions

When does school start in San Mateo County, California?
Most districts begin in mid-to-late August. Exact first days vary by district and year, so check your district’s adopted calendar.

When does school get out for summer in San Mateo County?
Most schools end in late May or early June, with many high school graduations in the final week or two.

How many days are in a school year in San Mateo County?
Districts provide about 180 instructional days and also meet California’s minimum instructional minutes by grade level.

How do I find out if school is cancelled today in San Mateo County?
Check your district’s website and social media, watch for automated calls or texts, and follow the San Mateo Daily Journal, KRON 4, KTVU, KPIX, ABC7, or NBC Bay Area. On the coast, the Half Moon Bay Review also reports closures.

What is the spring break schedule for San Mateo County schools?
Spring break is typically one week in late March or April. Each district sets its own dates, and some tie it to Easter while others do not.

How do I enroll my child in San Mateo County schools?
Start with the district that serves your address. Most offer online registration. You will need proof of residency, proof of age, and immunization records.

Are there any year-round schools in San Mateo County?
Traditional calendars are the norm. A few charter or alternative programs may use different schedules, so ask your district or the specific school.

Who do I contact about school calendar questions in San Mateo County?
Contact your district office or your child’s school first. For help finding the right district or program, the San Mateo County Office of Education can point you in the right direction.