The 6-foot-3, 221-pound Fields, of Kennesaw, Ga., rated five stars and ranked in the top 10 overall in the nation by Rivals, 247Sports and ESPN, announced his decision Tuesday night in a Twitter post, calling it "probably the hardest decision I've had to make."
"My decision to reopen my recruitment is in no way a reflection of any deficiencies of [Penn State], its coaches, players or fans," Fields wrote. "I still believe that PSU is a great academic and athletic opportunity for any student athlete and it will remain one of the top schools that I would consider."
Fields' stock has risen in recent weeks. He earned an invitation to the Elite 11 competition and then won a spot in the Opening Finals, an annual showcase held at Nike's world headquarters in Oregon.
According to reports, Florida is going hard after Fields, and other SEC schools have intensified their interest, as well.
Fields committed to Penn State last Dec. 1. He visited the university as recently as the weekend of the Blue-White Game. In one interview, he said he was "100 percent committed" to Penn State and something "crazy" would have to happen for him to change his mind.
Penn State coach James Franklin, while not allowed to comment on specific recruits before they sign with their chosen schools, issued a tweet later Tuesday night that said: