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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.
A normal pregnancy in horses lasts approximately 11 months around 340 days. Colts (a boy foal) tend to be carried longer than fillies (girl foals). Premature foals may be born â¦ and survive, with intensive care, after 310 days' gestation. Foals may, on rare occasions, be carried three to four weeks over time..onfidence votes 320. The gestation period for a horse is 340 days but it can vary to as short as 320 or as long as 360 and still be normal.