 She made her debut into single seater racing with the National Karting Series in the Philippines in 1999 at the age of 10.She has participated in the Asia-Pacific Karting Championships Japan, Shell Super Karting Series, Asian Karting Open Championship (AKOC), and the Italian Masters Series.In 2006 Bumgarner made her auto racing debut driving in the Asian Formula Three Championship, finishing third in the series' Promotion Class.