As more than 400 juniors from throughout the ACT run onto Canberra Stadium this weekend chasing premiership glory, none will be more determined than the 34 players in the under-15 girls grand final.

Gungahlin Black, coached by Raiders great Jason Croker, will take on Gungahlin Yellow in the first time girls have had a competition in the Canberra Junior Rugby League in three years.

Croker has been blown away by the physicality of the girls, but admits coaching the opposite sex does pose unique challenges.

''There are some tough girls in there and they rip in,'' he said.

''From when we started to where we are now, their skill has improved tenfold. We taught them the basics and they're running with it … when we can stop them talking.''

Given the task of leading her team around the park is first-year player Lily Pearson.

Having played rugby union against boys until she was 12, Pearson answered an advertisement looking for girls to give the 13-a-side code a crack this year and has not looked back.

''It's a really good experience,'' she said. ''You get a couple of big tackles every game, but it's been all right.

''Definitely, the fitness is the toughest part, but playing the whole game's been challenging.''

Rival captain Maddie Perceval bases her game on South Sydney star Greg Inglis, hoping to emulate the Kangaroos and Queensland fullback with his electric runs.

The under-15 girls grand final kicks off on Sunday at 12.45pm.

More than 4500 people attended last year's two-day extravaganza. The action begins at 9am on Saturday with the under 10s.