Summerly (foaled March 31, 2002 in Kentucky) is an American Thoroughbred racehorse best known for winning the Grade 1 Kentucky Oaks in 2005. She was sired by 1990 Preakness Stakes winner, Summer Squall and out of the Mr. Prospector mare, Here I Go. Summerly raced from age two through age four and was then retired. She was sold at the November 2006 Fasig-Tipton broodmare sale for $3.3 million to WinStar Farm of Versailles, Kentucky. In 2008 and again in 2009, Summerly produced a colt by Distorted Humor.