Abdul-Malik Abu added 17 points and 16 rebounds for the Wolfpack (14-13, 4-10 Atlantic Coast Conference), who won their third consecutive home game.
Caleb Martin had 16 points off the bench for N.C. State.
Jaron Blossomgame scored a career-high 33 points to lead Clemson (16-11, 9-6). Sidy Djitte added 12 points and eight boards for the Tigers.
The Wolfpack won despite a subpar shooting performance by point guard Anthony Barber. The ACC’s leading scorer at 23.7 points, Barber scored a season-low eight points on 1-of-12 shooting from the field.
Barber missed his first nine shots before banking in a floater to extend N.C. State’s lead to 66-61 with 5:27 to play.
Rowan made a 3-pointer on N.C. State’s first possession of the game, but he was silent for the rest of the first half. That changed in a big way after halftime.
Clemson took a 40-35 lead after back-to-back 3-pointers to open the second half, but Rowan ignited a 16-6 run with 12 points for the Wolfpack.
He delivered a 3-pointer and a jumper to tie the score at 40. Three minutes later, he made a 3-pointer and two other jumpers on consecutive possessions to give N.C. State a 51-46 lead with 12:29 to play.
Clemson trailed 71-63 with 3:30 remaining, but Blossomgame brought his team back. He scored all of the points in a 7-0 run for the Tigers, cutting N.C. State’s lead to 71-70 on a 3-point play with 2:14 remaining.
But Rowan answered with a jumper from the left wing to extend N.C. State’s lead to three, and Avry Holmes missed a 3-point try for Clemson at the other end.
Barber made four free throws down the stretch to help the Wolfpack secure the victory.
Clemson: Blossomgame scored at least 22 points for the sixth time in the last seven games. . The Tigers missed a chance to reach 10 victories through 15 ACC games for the first time since the ACC expanded to a 16-game conference schedule in 1991-92.
N.C. State: Barber took a rare break midway through the first half, resting for more than three minutes. He had played at least 38 minutes in eight consecutive games. . Abu had 10 points, including three dunks, and nine rebounds in the first half.
Clemson visits Georgia Tech on Tuesday.
N.C. State hosts No. 5 North Carolina on Wednesday.