Locals came out dressed as superheroes, ladybugs, soldiers and pirates to take the icy plunge on Saturday.
The annual Heart Stopper Challenge, run by Heart Kids Rotorua, was held at the Rotorua Aquatic Centre for people to raise money and show support for children who suffer from heart disease.
Seven teams, each with about four to six members, jumped into a pool of 10C water for six minutes.
This was to mimic what it feels like for a child to have icy water flushed through their chest during heart surgery.