Welsh Cobs typically reach full height between 4 and 5 years old, though this varies by type, genetics, nutrition, and environment.
Approximate mature heights: Welsh Cob A: 11.2–12.2 hands; Cob B: 12.2–13.2 hands; Cob C: 13.2–14.2 hands; Cob D: 14.2 hands and over. Consult a veterinarian or horse professional for specifics on an individual horse.