Summit is a one-point loss away from being undefeated.
The Spartans (7-1) have won seven straight games since a 21-20 loss to Spring Hill (4-3) in the season opener.
"We were up 20-7 with about six minutes to go and we had some cramping issues and things of that nature," said Spartans coach Brian Coleman. "We ended up with about five sophomores on the field at one time. Dontae Smith is a good running back and we had trouble tackling him in the fourth quarter.
Spring Hill rallied for two late touchdowns to win the game. Smith is a Georgia Tech commit who rushed for 2,204 yards and 21 TDs last year.
Coleman said Summit didn't know its identity back then, but the Spartans do now.
They're ranked second in Class 5A behind Beech (8-0).
The Spartans have clinched their first Region 5-5A title in school history. Summit is 5-0 in the region with two regular-season games left.
"That's a great accomplishment," Coleman said. "Being a region champion, we get to host the first round, but we've never won a playoff game. So all of this would be unchartered territory for us."
Running back Tai Carter, a senior who has an offer from Toledo as a cornerback, leads the Spartans in rushing in 1,194 yards and 14 TDs. He rushed for 1,300 yards last season.
George Odimeqwu is second with 751 yards out of Summit's wing-T attack.
Middle linebacker Robert Holmes, the Spartans' leading tackler, has an offer from Birmingham Southern.
Quick starts have become a trademark for the Spartans, who have outscored their opponents 83-6 in the first quarter.
Summit has a bye Friday before visiting Centennial (3-5) next week.