Prep reclaimed the league crown Saturday morning, as it had seven top-15 finishers to run past Chadwick, 39-40, at L.A. Pierce College.
The Rebels, who took second to Pasadena Poly last season, automatically qualified for the CIF Southern Section Division V prelims, which will be held at Mount San Antonio College in Walnut on Nov. 13.
"The nice thing about this is that things have been coming along smoothly," said Flintridge Prep Coach Ingrid Herskind, who piloted the Rebels to their 14th league title since taking over the program in 1996. "You can see it coming in bits and we'd changed our training regimen.
"Putting in more miles helped us gain our focus more. We really wanted to win to put us back into the mentality of the program."
Prep's girls' team took third and also advanced to the Division V prelims.
In the boys' portion of the meet, won by Chadwick's Lucas Lebovits in 15 minutes 56.19 seconds on the muddy 2.91-mile course, the Rebels saw their top seven runners turn in solid performances reminiscent of yesteryear.
Prep was led by senior Jason Bunn, who clocked 16:26.60 to finish fourth, behind Lebovits and Alec Borsook (15:58.02) of Chadwick and Bailey Stockdale (16:03.65) of Webb. The Rebels enjoyed a windfall between the seventh and 15th spots.
After Michael Caughron (16:36.88) of Pasadena Poly and Sam Cartwright (16:42.11) of Chadwick placed fifth and sixth, respectively, the Rebels provided Bunn support. Jesse Redding of Prep took seventh (16:45.21), followed by Elias Ellison (eighth, 16:51.02), Eli Weinstein (ninth, 16:52.62), Taylor Beith (11th 17:18.45), Jake Johnson (12th 17:24) and James Bradley (15th 17:38) to propel the Rebels.
"Last year, we were a bit dysfunctional," said Bunn, who finished fourth in the event for the second straight season. "This year, we have had everybody on the same page and we had a lot more confidence that we could win league.
"There are no more excuses."