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This article is about horses. Filly is also a small village in the Ardennes in Belgium.
A three-month-old American Warmblood foal
A Fjord horse fly with her dam (mother)

A filly is a young female horse too young to be called a mare. There are two specific definitions in use.

  • In most cases filly is a female horse under the age of four years.
  • In some nations, such as the United Kingdom and the United States, the world of horse racing sets the cutoff age for fillies as younger than five years.[1][2]

The equivalent term for a male is a colt. When horses of either sex are less than one year of age, they are referred to as foals.[3] Horses between one and two years of age may also be called yearlings.

See also[edit]


  1. ^ Hammond, Gerald (2000). The Language of Horse Racing. London: Taylor & Francis. p. 79. ISBN 1-57958-276-1. OCLC 44923115. 
  2. ^ Privman, Jay (October 24, 2008). "Zenyatta completes perfect season". Daily Racing Form (Breeders' Cup). Retrieved September 7, 2011. It was the perfect end to a perfect day by a perfect filly. Zenyatta, the best older female horse in the country, completed a perfect season. . . by winning the $2 million Ladies' Classic on Friday at Santa Anita's Oak Tree meeting, the first of two days of the 25th Breeders' Cup championships.  (Zenyatta was foaled in 2004, making her a 4-year-old at the time.)
  3. ^ James R Gillespie (2000). Modern Livestock and Poultry Production. Thomson Delmar Learning. ISBN 978-0-7668-1607-7.