International School for Science and Culture — Academic Calendar — Costa Mesa, California

Academic Calendar

In the United States, the school-year calendar is set by the local school district — not by the state or federal government. Exact start, end, and break dates for International School for Science and Culture are determined by the International School for Science and Culture District.

Most US public schools operate on a standard August/September–May/June calendar with around 180 instructional days.

Exact calendar: set by International School for Science and Culture District. See the district/school website for confirmed dates.

Typical US Academic Year (2026–2027)

Approximate windows — dates vary by district. Confirm with International School for Science and Culture directly.

Fall Semester

Mid-Aug – Late Dec

Winter Break

Late Dec – Early Jan

Spring Semester

Early Jan – Late May

Spring Break

1 week in March/April

Summer Break

June – August

Ranges typical for public schools in California. Your district calendar is the source of truth.

Typical Federal & National Holidays Observed

Most US public schools observe these federal holidays — exact day-off status varies by district.

Labor DayFirst Monday of September

Indigenous Peoples' Day / Columbus DaySecond Monday of October

Veterans DayNovember 11

Thanksgiving BreakThursday + Friday of 4th week of Nov

Winter BreakLate December through early January

Martin Luther King Jr. DayThird Monday of January

Presidents' DayThird Monday of February

Spring BreakOne week in March or April

Memorial DayLast Monday of May

Why We Don't Show Exact Dates

Unlike some countries with nationally-set school calendars, US school-year dates are decided by each of the roughly 13,000 school districts. Calendars also vary between traditional, year-round, and balanced-calendar schools within the same district. For the authoritative calendar of International School for Science and Culture, check the school's website or contact the district office.