Chorus plateau categories are based on the average percentile results from the two previous contests in which the chorus was entered.
| AAAA | 70% and above |
| AAA | 60 – 69.9% |
| AA | 55 – 59.9% |
| A | 54.9% and below. |
First-time competitors will not be eligible for plateau awards, but their initial contest score can be used to place them in their next contest. A chorus that has not competed in any contest for more than four years will reenter the contest cycle as a Plateau A chorus.