The win means Boys' High will take the fourth semifinal spot and play top qualifiers Maungakaramea next week, while Springfield will face Mangapai in the other semifinal.
The premier women's playoff was decided by a dramatic extra time golden goal on Friday night.
Whangārei Girls' High School went in favourites to the playoff against Hikurangi but left their numerous parent supporters biting their nails when the regular time ran out with the score at 2-all.
It wasn't until late into the second period of extra time and with both teams down to seven players that Girls' High found the winner to force their way into next week's semifinal against Old Girls.
The second semifinal next week will see Springfield play Maungakaramea.
In the reserve grade semifinals Maungakaramea face Boys' High and Mangapai play Hora Hora in the men's grade and Hikurangi face Girls' High and Old Girls play Maungakaramea in the women's.