Yes April 6 was the official opening date of Six Glags Great Adventure. The season hasn't started yet so they are currently only open Friday's, Saturdays, and Sundays, but always check their calendars to see when they will be open on weekdays.
U can check exact information through website,all details nd timings given
As per the email I've received, it stated it is open from 4/3-4/17
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