When can i enter the parking lot @ six flags great america?

Question

I'm just wondering when you can enter the parking lot, or is it the same time at 10:00

Answer 1

You can enter anytime after opening until closing.

I'm not exactly sure when they start letting people in, but the earliest we ever came was 9:30 and the lots were already filling up.  I'd say around 9ish they start letting people in.

Answer 2

If I remember correctly the parking lot opens at 9 and then the gates at 10.