Starting a 20/1 outsider in a six-runner field she raced in second place behind the favourite Cardini before taking the lead a furlong out and drawing away to win easily by four lengths.

On 26 August Iridessa was moved up in class to contest the Group 2 Debutante Stakes over seven furlongs at the Curragh in which she was ridden by Donnacha O'Brien and finished fifth of the nine runners behind Skitter Scatter.

Ridden by Wayne Lordan she started a 14/1 outsider in an eight-runner field which included Pretty Pollyanna, Hermosa, Antonia de Vega (Prestige Stakes) and Beyond Reason (Prix du Calvados).

Iridessa raced in mid-division before making a forward move in the last quarter mile but was obstructed when attempting to obtain a clear run.

[6] Iridessa began her second season in the Leopardstown 1,000 Guineas Trial Stakes on 6 April and finished third of the fourteen runners behind Lady Kaya and Happen.

On 5 May the filly started 6/1 for the 1000 Guineas over the Rowley Mile at Newmarket, but after tracking the leaders she was outpaced in the final furlong and came home eighth to Hermosa, three lengths behind the winner.

For her next race, Iridessa was stepped up in distance and matched against older fillies and mares in the Group 1 Pretty Polly Stakes over ten furlongs at the Curragh in which she was ridden by Wayne Lordan.

She raced just behind the leaders Magic Wand and Wild Illusion before taking the lead inside the final furlong and pulling away to win by two and a quarter lengths.

Laurens set the pace from Hermosa with Iridessa settled in fourth place before making a forward move in the last quarter mile.

[10] At Newmarket on 5 October Iridessa was made third choice in the betting behind Hermosa and Lauren in the Group 1 Sun Chariot Stakes over the Rowley mile.