Filly Guide

Filly Definition: What Is a Filly Horse?

A filly is a young female horse, typically under 4 years old (under 5 years in UK racing terminology). The term "filly" specifically refers to female horses that have not yet reached maturity, at which point they become known as mares.Understanding horse terminology can be confusing, especially when distinguishing between different age groups and genders.

Horse Life Cycle: Where Does a Filly Fit?

To fully understand what a filly is, it helps to see where she fits in the horse life cycle. Horses go through several developmental stages, each with its own terminology based on age and gender.Foal0-1 year old • AnyA baby horse of either gender. This is the term used from birth until the horse's first birthday.Yearling1-2 years old • AnyA horse between 1 and 2 years old.

Filly vs Colt: What's the Difference?

Another common question is the difference between a filly and a colt. The answer is simple: gender.Both fillies and colts are young horses under 4 years old. The only difference is that a filly is female, while a colt is male. Think of it like the difference between a girl and a boy—same age group, different genders.Remember: Filly = Young Female, Colt = Young Male. Both are under 4 years old.