Are you wondering when your pregnant mare will foal? Use our Mare Gestation Calculator to find out! The average gestation length in the mare ranges from 320 to 362 days; most mares will foal within 330-345 days of successful breeding.

What time do mares usually foal?

Observers have noted that 75 percent to 85 percent of foals are born between 6 p.m. and 6 a.m. Some mares, if continuously “checked,” will delay delivery for several hours or days, until left in solitude.

In what season do mares normally give birth to foals?

Under natural circumstances, mares tend to give birth to foals in the spring and summer, after 11 months of gestation. This is when grass is most plentiful, so the new mother has plenty to eat, promoting milk production.