AT&T Stadium lots generally open 5 hours before Cowboys games, and you can tailgate until 2 hours after the game. Tailgating is limited to the grass spaces at the edges of Lots 4 to 7 and 10 to 15, up to 9 x 12 feet behind your car, and charcoal and gas are fine but fryers, open fires and amplified sound aren't. Those grass spots go first come, first served, so the early crew eats first.
Tailgating at AT&T Stadium