Bloomquist was All-State and all-league Most Valuable Player in baseball at South Kitsap High School in Portuguese Orchard, Washington and was an eighth round pick in 1996 MLB draft. He was a high school teammate with former Major Leaguer Jason Ellison.
He chose to accept a scholarship to Arizona State University. In 1998, Bloomquist tied a College World Series single-game record with five hits in a game with Long Beach State.
He was honored as Pac-10 Player of the Year in 1999 and was named first-team All-American by Baseball America.
He finished his college career with a.394 (256/649) average over three seasons and was named Arizona State University On Deck Circle Most Valuable Player, an award also won by MLB players, such as Dustin Pedroia, Ike Davis, Paul Lo Duca, and Barry Bonds.