When does the school year begin in Orange County? July 15, 2019 by Mitchell Mcdonalid·Comments Off on When does the school year begin in Orange County? Share this...FacebookPinterestTwitterLinkedin Some educational institutions in Orange County remain open throughout the year. During the 2019-2020 academic year, the Orange County Public School system reportedly has scheduled the first day of classes to begin on Monday, August 12, 2019. No related posts.