Even after shooting 10 under par through the first 36 holes, Cummins knew he'd need to go low again Tuesday to hold on.
“In the past, the winning scores had been right around 10 under, but I knew I'd have to go under par today to win,” he said. “I knew (runner-up Wesley Jackson of Fort Gibson) would come out and try to make a bunch of birdies.”
Jackson, who started the day two behind Cummins, shot a 2-under-par 70 on Tuesday to finish five shots back.
Cummins finished fifth last year as a freshman, and said Tuesday's title is the most meaningful win he's had.
“This is pretty special,” he said. “I'll get to always be a state champion.”
The round of the tournament came from Ada senior Justin Powell with an 8-under-par 64 Tuesday, helping the Cougars post a six-stroke victory over Heritage Hall for the team title.
It was Ada's 10th team championship in boys golf, but first since 1989.
Powell's round, which included three eagles, three birdies and just one bogey, moved him into third individually at 208, with Cody Shore of Poteau and Garrison Mendoza of Clinton tying for fourth at 209.