Ventura looked poised to win its first CIF title since 2000.
Touchdowns by Josh Januska, Tyler Peralta and Tommy Grossman had the Cougars up 24-11 at halftime against Palos Verdes in the CIF Western Division final.
But the Cougars could not close it out as the Sea Kings outscored Ventura 21-0 after halftime and won the championship 32-24.
Januska raced 100 yards on a kickoff to give Ventura an early 7-3 lead.
Tyler Peralta scored from 1-yard out to make it 17-11 Cougars in the second quarter.
Following a Keenan Moran interception, Tyler Smith found Tommy Grossman for a touchdown just before half to give Ventura a 24-11 lead.
But the Sea Kings scored back to back touchdowns in the third quarter to take s 25-24 lead and quarterback Steve Delcarson added a fourth quarter touchdown for the final margin of victory.
Ventura ends the year 12-2.