For the first time in decades, fans will be able to buy beer in the stands, rather than having to miss some of the on-field action when they walk out to the concession area.
Beer will be sold, one at a time, to fans 21 years and older with valid ID. Vendors will accept credit cards and cash.
The in-seat beer sales begin with Monday night's game against the San Francisco Giants.
The change in policy follows a modification of the stadium's liquor license by the state Department of Alcoholic Beverage Control, according to the team.