Bred by Winbak Farm of Chesapeake City, Maryland, 2004 Horse of the Year Rainbow Blue was foaled on March 8, 2001. She was purchased for $10,500 at the 2002 New Jersey Classic Yearling Sale by George Teague, Jr., sister Brenda, and Kevin and Ron Fry of K&R Racing, LLC, all of Houston, Delaware. Rainbow Blue posted a remarkable lifetime record of 32-30-0-1 and remains only the third filly pacer ever to win the Horse of the Year award. At her retirement, she was the top single-season moneywinning pacing filly of all time, and had recorded two of the three fastest miles ever paced by a three-year-old filly. Rainbow Blue was trained by George Teague, Jr. and most often driven by Hall of Famer Ron Pierce.
As a two-year-old in 2003, Rainbow Blue earned $102,674 while winning 6 of 7, including divisions of the Debutante Stakes and the Molly Pitcher. Her season was cut short because of a knee injury.
In 2004 Rainbow Blue won 20 of 21 races. Her only loss came when she went off stride in the Mistletoe Shalee on Hambletonian Day at the Meadowlands. Victories that season included the Blossom Series, Rose Red final (in a Hazel Park track record 1:51.1f), New Jersey Sire Stakes final for three-year-old filly pacers, Ladyship Stakes, Tarport Hap (in a stakes record 1:50), Mistletoe Shalee elimination, Fan Hanover Stakes (equaling a 1:49.2s world record in the elimination), Nadia Lobell (in a track and stakes record-setting and world record-equaling 1:49.2), Glen Garnsey Memorial, Breeders Crown (in a stakes record 1:51s) and the Matron Stakes. Rainbow Blue was the year's leading dashwinning three-year-old pacer and moneywinning pacer with $1,195,010 in earnings. She was the first three-year-old filly pacer to win two sub-1:50 miles. Her average margin of victory that year was 2 3/4 lengths. Rainbow Blue was elected Three-Year-Old Pacing Filly, Pacer of the Year and Horse of the Year.
As a four-year-old in 2005, Rainbow Blue won 4 of 4 and earned $131,250. Victories included two Classic Series races at Woodbine Racetrack and Dover Downs, where she set the 1:49.4 world record for all-age and four-year-old pacing mares on a five-eighths mile track. Sadly, a tendon injury brought her racing career to an end.
Rainbow Blue is currently performing her broodmare duties in Pennsylvania for Teague Racing, Inc. and K&R Racing, LLC.