In the Oaks at Epsom Racecourse on 7 June she was the least fancied of her trainer's three runners and started a 25/1 outsider in a fifteen-runner field. Ridden by Brian Rouse she exceeded expectations as she came home fourth behind Midway Lady, Untold and Maysoon. Pat Eddery took the ride when the filly was sent to Ireland to contest the Irish Oaks on softer ground at the Curragh on 12 July. Untold (the choice of Stoute's stable jockey Walter Swinburn) was made the odds-on favourite ahead of the Pretty Polly Stakes winner Fleur Royale with Colorspin the 6/1 third choice in a field of eight fillies. Ridden with great confidence by Eddery, Colorspin tracked the front-running Fleur Royale before taking the lead a furlong out and won "very easily" by three lengths with a gap of twelve lengths back to Untold in third place. On 19 August Colorspin, ridden by Swinburn, started 9/4 favourite in a strong renewal of the Yorkshire Oaks which included Gull Nook (Ribblesdale Stakes), Park Express, Untold, Fleur Royale and Ivor's Image (Oaks d'Italia). Racing on much firmer ground she finished fourth of the eleven runners behind Untold, Park Express and Ivor's Image. On her final appearance Colorspin was matched against male opposition and older horses in the Irish Champion Stakes at Phoenix Park Racecourse on 7 September. She never looked likely to win and was outpaced in the straight, coming home eleventh of the thirteen runners, some sixteen lengths behind the winner Park Express. In 1985, the independent Timeform organisation gave Colorspin a rating of 117 p (the "p" indicating that she was expected to make more than usual improvement), making her seven pounds inferior to their best two-year-old filly Femme Elite. In the official International Classification she was rated twelve pounds behind the top-rated Bakharoff and nine pounds behind the leading filly Baiser Vole. In the following year Colorspin was rated 118 by Timeform, eleven pound behind their best three-year-old fillies Sonic Lady and Darara. She was rated nine pounds behind the top-rated Sonic Lady in the International Classififcation and was the sixth-best three-year-old filly in the 11 furlong plus division. Colorspin was retired from racing to become a broodmare at the Meon Valley Stud.