I've had many mares go a full year without any problems. Unfortunately, there isn't such a thing as a due date with horses. "Normal" gestation is 320 -370 days. There are reports of 400 day pregnancies with totally normal foals. In my experience, if the mare has had foals in the past, the milk will be white immediately prior to giving birth. However, milk isn't a totally reliable indicator. Check the vulva (it should be relaxed and elongated), the shape of the mare (slab sided), her behavior (restless and not eating) and tail head (mushy). Good luck and can't wait to see your foal when it decides to make an appearance.
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