Where is winning colors race horse now?

Answer

Winning Colors (born 1985) is an American Hall of Fame Champion Thoroughbred racehorse and one of only three fillies to ever win the Kentucky Derby.

It appears that she maybe in foal in Ky according to http://www.pedigreequery.com/winning+colors

In foal to Mr. Greeley for '07.

Euthanized February 17th, 2008 from complications of colic at the age of 23. Buried in the Greentree Farm cemetery, a division of Gainesway Farm in Lexington, Kentucky.