The Giants are hosting a three-game series against the San Diego Padres this weekend.
The games are the first at home for the Giants since the bombing at the Boston Marathon on Monday that killed three people and injured scores of others.
Team officials said there will be mandatory bag inspections and wanding at all gates into the ballpark, which opens two hours prior to the first pitch.
Oakland police also stepped up their visibility earlier this week at Oakland A's baseball and Golden State Warriors basketball games in the days following the deadly Boston bombing.
The Giants' series against the Padres continues at 6:05 p.m. Saturday and 1:05 p.m. Sunday.