Playoffs will then be held in each of the three divisions, with a champion crowned in the premier grade, premier two grade, and division one competition (as well as development competitions).
Bay of Plenty Rugby Union chief executive Mike Rogers said there had been plenty of consultation between the union and sub-unions since 2014, and this was what they decided upon.
"I don't think there is a perfect formula, but this is the one they felt was the best," he said.
Talks are still being had to determine whether the Baywide premier competition will feature semifinals or go to a straight final on August 6.
Rogers said the window at that time of year was very tight, with the Mitre 10 Cup kicking off soon after.
"You want all the contracted Steamers players to be available to play in the club competition but we also need to make sure our Steamers have enough time to prepare for the Mitre 10 Cup," he said.
"So that is now being reviewed."
- Round one format:
Premier grade: Arataki, Mount Maunganui, Paroa, Whakatane Marist, Greerton Marist, Te Puna, Whakarewarewa, Rotoiti, Opotiki, Tauranga Sports, Rangataua, Te Puke Sports.
Division One: Te Teko, Marist St Michael's, Kahukura, Galatea, Ruatoki, Ngongotaha, Katikati, Rangiuru, Poroporo, Waikite, Judea, Papamoa.