Perham shot 48% (24-50) from the field and made 14-of-18 free throws.
Finn Diggins led the Yellowjackets with 26 points, 8 rebounds and 3 blocked shots. Charlie Rasmussen scored 16 points and just missed a double-double, collecting 9 rebounds. Grant McMartin also finished in double figures with 13 points on 6-of-8 shooting. Carter Aakre had a team high 3 assists.
East Grand Forks was led by 20 points from Nathan Willet. Sam Votava and Julian Benson contributed 15 and 14 points, respectively, and Tanner Campos added 11. Willet had a team high 9 rebounds.
Perham (28-0) will now face Fergus Falls (25-4) at 7:00pm Friday for the Section 8AA championship at Concordia College in Moorhead.
East Grand Forks ends their season with a record of 26-3.