The 6-foot-11, 240-pound Fresno (Calif.) San Joaquin Memorial 2012 center's mother, Ceylon Sherman, told Scout.com that Upshaw picked the Wildcats over fellow finalists Louisville, Georgetown and Fresno State.
"Basically, everything the family had put down and discussed before recruiting started – the school, academics, coaching, the team, him being able to come in and play – he found everything at Kansas State," Sherman said.
The Kansas State coaching staff, led by head coach Frank Martin, made a big impression on the family.
"He really liked Frank (Martin)," Sherman said. "He's a good coach and he rides all of his kids all the way until the end. Rob just felt that he and coach Martin would have good chemistry together."
Upshaw's mother is confident about where he son fits into the Kansas State program.
"I think he'll fit into the program all-around," she said. "Rob is a unique 7-footer and I just think he'll be able to adapt to the situation and go in and get better and do what he needs to do."
Upshaw will have a ceremony announcing his decision at 2:00pm PST at his school's library.
The four-star prospect joins Kansas center Laimonas Chatkvevicius in the Wildcats' 2012 recruiting class.