1983: two-year-old season

Sent into training with Jeremy Tree, Rainbow Quest began his racing career at Newmarket Racecourse in August 1983 when he defeated twenty-nine opponents in the El Capistrano Stakes. In the following month, he beat nineteen rivals in the Haynes, Hanson and Clark Conditions Stakes over one mile at Newbury Racecourse. In October, Rainbow Quest was matched against El Gran Senor, Siberian Express (winner of the Prix Morny), and Superlative (July Stakes) in the Dewhurst Stakes at Newmarket. El Gran Senor took a lead in the closing stages, but Rainbow Quest cut his advantage back to half a length at the line. In the 1983 International Classification, Rainbow Quest was rated the second best two-year-old in Europe, one pound behind El Gran Senor.^[1]

1984: three-year-old season

On his three-year-old debut Rainbow Quest was beaten a short-head by Lear Fan in the Craven Stakes and then finished fourth behind El Gran Senor, Chief Singer, and Lear Fan in the 2000 Guineas. He was then diverted from The Derby to the Prix du Jockey Club, in which he finished third behind Darshaan and Sadler's Wells. He was then sent to Ireland, where he finished second in the Irish Derby, beaten a length by El Gran Senor. In August, Rainbow Quest returned to England and recorded a victory in the Great Voltigeur Stakes. On his final appearance of the season, he contested the Prix de l'Arc de Triomphe at Longcamp in October. He was made favourite for the race by British bookmakers but finished eighteenth of the twenty-two runners behind Sagace.^[2]

1985: four-year-old season

Rainbow Quest began his third season with an easy win in the Clive Graham Stakes at Goodwood Racecourse in May. He then ran in the Coronation Cup at Epsom Downs Racecourse and recorded a win from Old Country. In July, Rainbow Quest finished second to Pebbles in the Eclipse Stakes and third behind Petoski and Oh So Sharp in the King George VI and Queen Elizabeth Stakes. On his final appearance, he ran for the second time in the Prix de l'Arc de Triomphe. He finished a neck behind Sagace but was awarded the race when the French horse was disqualified for causing interference.^[3]

Major winners

c = colt, f = filly, g = gelding

Broodmare sire

Rainbow Quest was the Leading broodmare sire in Great Britain & Ireland in 2003 and 2004. Among his daughters' top runners were:

c = colt, f = filly, g = gelding