Sitting third behind Walton's "A" and "B" teams after Monday's first-round action, Hillgrove shot a combined 143 on the nine-hole course to rise to the top of the team standings with a two-day score of 301. The Hawks won the county title for the first time in their five-year history.
"It's a big accomplishment, you know," Hillgrove coach Spencer Bernstein said. "It's a great field. I knew we had a shot coming in to this, but you just don't ever know until you come in to it. Last week, we actually didn't play our best golf, and to turn it around and win with all these great teams is really a big accomplishment."
Walton's "A" team, the leader after the first round, shot 152 to finish two shots behind Hillgrove at 303.
Reigning champion Lassiter (316) was third, followed by Walton "B" (322), Kennesaw Mountain and Pope (326 each), Wheeler and Walker (331 each), Allatoona (333), Sprayberry (395) and North Cobb (400).
Walton freshman John Yi also came from behind to win the individual title.
It took extra holes for Yi, who was tied for fourth after the first round, to win the title as he tied the first-round leader, Hillgrove's Matt McKagen, with a 71 and then beat him on the second playoff hole.
Yi, who shot a 37 on Monday, came back with a 34, including two birdies, on Tuesday to tie McKagen, who followed up Monday's first-round score of 36 with a 35.
Both golfers parred the first playoff hole, but Yi birdied the second hole after McKagen made another par to secure the county title.
"It feels good just to win the tournament, especially with all the competition from Cobb County," Yi said.
Hillgrove's Jeff Pickens finished third with a 72. Rounding out the top 10 were Walton's David Yowell, Kennesaw Mountain's Cole Hunsicker and Hillgrove's Kevin Tillis (75 each), Lassiter's Max Wyrick (76), Allatoona's Boyd Wilson and Pope's Kevin Fraser (77 each), Lassiter's Brody Judd and Walton's Tanner Landry (78 each) and Walton's Zack Weld, Tyler Moore and Justin Cobkit (79 each).