1981: two-year-old season

Dara Monarch did not place in his first race, which was over six furlongs. In his second race, which was over seven furlongs, he came in second. Despite losing his first two races, Dara Monarch was entered in the Group Three Anglesey Stakes, a six and a half furlong race at the Curragh Racecourse in August. Starting a 66/1 outsider, he recorded his first success as he won by a length from the Vincent O'Brien-trained favourite Americus. The following month, Dara Monarch placed third in the Railway Stakes at the Curragh Racecourse, finishing strongly behind the winners Anfield and Day Is Done. The race was over the same six and a half furlong course as the Anglesey Stakes. On his final appearance of the year, he was stepped up in distance for the Ashford Castle Stakes over one mile in September but ran poorly and finished last of the eleven runners behind Anfield.^[3]

1982: three-year-old season

Dara Monarch began his second campaign in the McCairns Trial Stakes over seven furlongs at Phoenix Park Racecourse and won by a length from Senior Citizen. The colt then faced a steep ascent in class when he was sent to England for the 2000 Guineas over one mile at Newmarket Racecourse on 1 May. He started the race at odds of 33/1 and was among the leaders for most of the race. However, he became tired in the final furlong and finished eighth out of 25 runners, with the French-trained Zino beating Wind and Wuthering in a photo-finish. Mick Kinane took the ride when the colt lined up for the Irish 1000 Guineas at the Curragh two weeks later. Wind and Wuthering was the favorite in a field of 14 runners, with Cajun and Raconteur also being heavily backed. Dara Monarch was an outsider at 20/1. The other contenders included Tender King (third in the 2000 Guineas), Anfield, Achieved (Phoenix Stakes), Full Extent (Gimcrack Stakes) and Red Sunset (Coventry Stakes). In a change of tactics, Dara Monarch was restrained towards the rear of the field before making his challenge on the outside in the last quarter mile. He accelerated into the lead a furlong out and drew away from his rivals to win by three lengths from Tender King.^[2]

In June, Dara Monarch ran for the second time in England when he contested the St James's Palace Stakes (then a Group Two race) at Royal Ascot. The Henry Cecil-trained Ivano started 2/1 favourite, not so much because of his wins in the Feilden Stakes and Dee Stakes, but because of his reportedly outstanding performances on the training gallops. Dara Monarch was the 7/2 second choice, with the other seven runners including his old rivals Wind and Wuthering, Tender King, Anfield, Red Sunset and Achieved. Wind and Wuthering led the race before tiring in the straight, allowing Red Sunset to overtake. However, Dara Monarch, who had been held back by Kinane earlier in the race, came from the outside to take the lead a furlong and a half from the finish. He established a clear advantage and, despite hanging sharply to the right in the closing stages, held off Tender King to win by one and a half lengths with six lengths back to Ivano in third. Timeform described his performance as "exhilarating".^[2]

After the race, Dara Monarch was sold as a prospective stallion to the breeder Tim Rogers. The colt contacted a viral infection and was off the course for two and a half months returning in the Waterford Crystal Mile at Goodwood Racecourse when he finished last of the eight runners behind Sandhurst Prince. He failed to recapture his form in his two subsequent races, finishing fourth to Buzzards Bay in the Queen Elizabeth II Stakes at Ascot in September and fifth behind Pas de Seul when sent to France to contest the Prix de la Forêt at Longchamp Racecourseon 24 October.^[2]