The four-star running back chose hometown Arizona State on Friday in a press conference on FoxSportsArizona.
"I'm ready to help out the Arizona State program," said Foster.
The commitment from Foster is a huge one for the Sun Devils and new head coach Todd Graham.
Foster, a Semper Fidelis All-American, is the top running back in the West in the class of 2012.
"It feels great," said Foster.