Fremont (23-2) raced out to a 17-point halftime lead and cruised to a 60-27 win over American Fork for its first state title in school history.
Harley Hansen scored 14 points, while Sydnee Ward added 13 as the Fremont defense held American Fork to just 14 percent shooting (6-43).
"This is the best feeling in the world," said Shelbee Molen, who added 11 points and 5 rebounds. "We've been playing with each other since we were little and we're best friends. It's the best feeling ever."
"I did not expect this at all," said head coach Bryce Ballif about the blowout. "I felt like it was going to go down to the wire for sure. We kind of felt like we were a team of destiny. It's our 20th year for our school. This is a special group and they got our first title ever. It's special."
In the 4A championship game, Springville won a thriller over Skyline, 42-40, to win its second straight state title and 4th in the last five years.
Savannah Park hit two free throws with 2.7 seconds remaining, while Syndee Taylor missed the front end of a 1-and-1 that could have tied the game with one second left.
"I just knew that I needed to make those free throws," said Park, who finished with a game-high 15 points. "I missed a lot in the first half, and I knew that I needed to come out and make those."
"I knew she was going to make them," said center Brooke Wheeler. "That's her shot. Once she got fouled, I knew she was going to make us."
Tied at 18 at the half, the Eagles grabbed a 4-point lead headed into the 4th quarter, led by Taylor's 13 points. But as they did in the semifinals on Friday, the Red Devils stormed back in the final period to win in dramatic fashion.
"We just try to make it interesting," Park said with a smile.
Springville adds to its collection of state championships, winning in 2014, 2013, 2011 and 2010.
In other state championship basketball games Saturday night, Morgan won the 3A boys title, beating Cedar 59-45.
Wasatch Academy claimed its second straight 2A championship, easily defeating Enterprise, 76-47.
In the 3A girls final, Desert Hills defeated Morgan 57-43, while Enterprise knocked off North Sevier 43-28 to win the 2A championship.