The Shellharbour six-year-old showed more seasoned surfers how it's done, undefeated in four rounds of competition at Whales Beach in northern Sydney.

Jada was overall winner in the six-and-under category of the BL's Blast Off, the largest junior competition in Australia, organised by 1988 world surfing champion Barton Lynch.

"Jada has done an awesome job in some pretty rough conditions," Lynch said yesterday.

"At times the waves reached three to five feet - that's triple overhead for a little kid," he said.

"The surf was pretty challenging, the six-year-olds were really the stars of the show, getting the most waves from the crowd ... "

The under-six category is a new addition to the competition, after four year-olds were challenging grommets as old as eight.

"Jada won each of her four rounds so that just shows how consistently well she did. We had 40 or 50 kids in that category," Lynch said.

Jada, a member of the Southbridge Board Riders, first surfed solo about two years ago.

"I carried her on my board when she was about three and she's been surfing on her own since four," her dad Jeff said.

"I always ask her as the wave comes if it's okay but she rarely says no."