What is the gestation length for a horse?

• A. 336 days
• B. 320 days
• C. 350 days
• D. 360 days

Answer: (A)

Gestation length in horses is the time from conception to birth. The typical horse gestation is about 336 days, roughly 11 months. This average is what breeders and veterinarians use, even though there can be variation. Mares may foal a bit earlier or later—commonly—from about 320 to 360 days. The other numbers in the options represent ends of that range, but 336 days sits as the standard single estimate. Variability comes from individual mare differences, foal size, season, and pregnancy health, and due dates are always approximate rather than exact predictions.