You can re-enrol as of 1 June. Make sure to finalise your re-enrolment before 1 September! If you are not enrolled before 1 September you cannot participate in the courses and exams of the first period. The re-enrolment procedure may differ per situation. Read more about (Re)-enrolment.
Please note: It is only possible to enrol with a starting date of 1 September. There is one exception; if you’re starting a Master’s programme with an official starting date in February, then you may enrol as of 1 February. Other exceptions are only possible with the explicit permission of your department or Faculty.