Kammala jumla mai zuwa: A farkon farawarsa na 2013 a ranar 2 ga Afrilu, Bumgarner ya jefa innings takwas a kan Dodgers kuma ya kara da RBI a cikin nasarar 2-0. A kan Braves a ranar 11 ga Mayu, yana da mafi girman kakar wasa 11, yana karɓar nasara a cikin nasara 10 zuwa 1. An zabi Bumgarner ne don wakiltar National League don
2013 Major League Baseball All-Star Game, zaɓin sa na farko na All-Star. Kodayake a cikin jerin sunayen, ba a yi amfani da shi ba a cikin asarar NL ta 3<unk>0 ga AL. A ranar 27 ga Yuli, ya riƙe Cubs ba tare da ci ba har sau takwas amma ya sami rashin yanke shawara a cikin asarar 1-0. Ya yi daidai da lokacinsa mafi girma a strikeouts tare da 11 a ranar 2 ga Agusta a cikin nasara 4 zuwa 1 a kan Tampa Bay Rays.