Fostoria's boys made it five in a row and the girls edged defending champ New Riegel by a point Tuesday to claim both halves of the Tri County Bowling League at Heritage Lanes.
The Redmen boys posted a 38-2 mark, with runner-up Columbian going 27-13.
Austin Cornell helped FHS cap the crown with a 430 series. Bryson Shaver added a 393 and Anthony Thomas (360) and Brandon Connin (336) both bettered 335.
John Funk bowled a 334 series for Columbian, and Garrett Bean had a 192 game.
Lakota ended third overall (22-18), followed by New Riegel (17-23), Columbian II (12-28) and Calvert (4-36).
Gunnar Lentz had a 183 game for Lakota and Aaron Reasor added a 172.
Jarrett Mullholand and Dustin Theis each rolled a 341 series for New Riegel.
Fostoria's girls snapped a three-year title run by New Riegel, with the Redmen ending 31-9 and the Blue Jackets going 30-10.
Alicia Martinez sparked Fostoria with games of 184 and 181 for a 365 series. Alex Hersch added a 323 series.
New Riegel got a 318 from Amanda Weinandy, 310 from Mikayla Theis and a 275 from Whitney Weinandy.
Columbian's Jessica Wiley had a 346 series and Julie Funk rolled a 303.
Lakota finished 26-14 to end third, holding off Columbian and its 25 1/2-14 1/2. Calvert came in fifth (6 1/2-33 1/2).