The announcement comes as the addition of the pitch clock has shortened game times throughout Major League Baseball.
Team officials say while vendors will still stop selling in the stands at the end of the 7th inning, 40% of locations throughout the stadium will stay open through the end of the game - or four hours after the first pitch - whichever comes first.
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At least four other teams have extended alcohol sales through the 8th inning so far.
The Astros said it would continue to reserve the right not to serve fans at its discretion.
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