Is it open in winter?

They are open until Jan 1st. After that, they're closed until the spring.

Sure is! There's a holiday theme in the park and everything is decorated.

Yes the winter wonderland is open. Definitely look on the website for operating hours

A very specific timing and days from Thanksgiving till new year

Yes but on a shorter day schedule

Yes until 9pm on the weekends but not the full park, slot of th rides are closed due to the weather but their holiday in the park is very nice

Six Flags Great Adventure is open for Holiday in the Park through January 1st. Mostly open only Friday evenings, Saturdays, and Sundays. There are a few exceptions that you can find on their website. Not all of the rides are open. The whole back section is closed (Kingda Ka, El Toro, Bizarro, Zumanjaro, El Diablo, Safari, and a few others). The whole park is decorated for the holiday and the tree at the fountain has a great show every 30 minutes starting at 5pm.

Yes, there is a holiday schedule up on the website

The water park portion is closed during the winter. The amusement park side is open.