Can I use my summer six flags for fright fest if they did not expire yet?? And also how much is parking?

Parking is free

Yes you can use your season pass for Fright Fest unfortunately if you want to go through the maze you have to pay $30 per person it's fun I was just there this weekend had a great time

Season pass allows you entry of the park but for the haunted maze you must buy a different ticket. And parking goes from 25-40 depending on how far or how much you're willing to walk

25 for parking season pass still cool u got 2 pay 2 get in the Horror houses

It's about $30 per person for all 7 mazes

25 for parking and yes u can use season pass for freight fest but the mazes and trails cost extra which u can buy individual trails/mazes or a bundle pack. Not 100% sure of the prices for trails though