Countryside wanted to make sure it didn't let Sickles pull off the upset in the Class 6A, District 7 final for the second straight year.
The Cougars didn't have to worry about that this time around, making quick work of the Gryphons 25-16, 25-20, 25-14 on Thursday.
"It's a good feeling to win districts," Countryside coach Kaylyn Bayly said. "We weren't real sharp but we were able to still pull it out so I guess that's a positive."
Sickles (13-12) jumped out to small leads in each of the first two games, but couldn't stop the Cougars from going on scoring streaks of five points in a row in Game 1 and six in a row in Game 2.
Countryside didn't trail a single time in Game 3.
Madison Truluck led all players with 13 kills and Cougars teammate Davionna DiSalvatore added 10.
Setter Sara Wright led Countryside with 30 assists.
The win kept the Cougars' undefeated season alive at 26-0, but Bayly knows it only takes one loss in the playoffs to ruin a season.
"Obviously now it's lose one and you're done," Bayly said. "If we just play our game I feel like we have just as good a chance as anybody else."