De Garis scooped top spot, with Matt Le Maitre second, Johnny Wallbridge third and Joey Abbott fourth.
Wave of the day was a 9.0 ride by Abbott in the semi-finals.
The Guernsey Surf Club is now checking the surf forecast to find a date for its annual longboarding championships.
Check out the images below from Ross Yates/@Skywavephotography for a taste of the action.
