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Occaisonally a mare will give birth at a shorter period than 11 months long, which can be at 10.5 months. Anytime before that foals that are born are deemed premature. On average, 340 days but a healthy gestation can be as few as 315 days and as much as 370. The gestational period of a horse is 11 months. 11 to 12 months all deppeand on the mare I had a mare go to 13 month before dropping. + 5 others found this useful.
Equine gestation facts and figures. Equine gestation is the period from conception to birth. It averages 340 days, but may range from 320 to 370 days, with mares being known to deliver a healthy foal after 399 days.