Pupils at some comprehensive and high schools in various parts of the country returned to class on Wednesday or will do so on Thursday.
Schools that open their doors this week include those in Lohja, Sammatti, Nurmes, Lieksa, Pielavesi, Kajaani, Sotkamo, Sodankylä, Somero, Kokemäki, Orivesi and Jämsä.
Most schools re-open next week. The schools that start earlier get a longer autumn break in late October.
More than 57,000 first graders start school this autumn.