Depends on the lot. You can park in a nearby garage at anytime. The stadium gates open 2hrs before gametime.
If you use stadium parking, its 2 hrs prior to game time.
Parking Lots open 2 hours before the game if I remember correctly.
We parked in a private lot a few blocks from the stadium
Don't know. I use the train and commute in. Much easier and the parking is free and 24hrs.
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