From now until the end of this month kindergarten teachers and staff will attend training courses, and all preschools will be disinfected.
The Department of Education and Training will monitor the schools once they reopen to decide if any needs to shut down in case of Covid-19 outbreaks.
Kindergartens have remained closed for eight months now and many teachers have had to switch to other jobs to earn a living.
HCMC has more than 1,360 preschools, 472 of them public, and 1,800 private nurseries.
It has more than 355,000 children aged between three and five.
On Dec.13 ninth and 12th graders in the city returned to school after seven months on a two-week trial. Then the city decided to have students in grades 7, 8, 10, and 11 also attend classes from Jan. 4.