Enter your mare's Last Breeding Date and the Horse (Mare) Gestation Calculator will work out her Estimated Foaling Date, along with Days Pregnant, Earliest Safe Foaling, Latest Expected Foaling, and Days Until Due Date — everything you need to plan ahead for foaling season.
Estimated Foaling Date
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Days Pregnant (Current)
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Earliest Safe Foaling
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Latest Expected Foaling
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Days Until Due Date
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The average gestation period for a mare is around 340 days (about 11 months), but it can range from 320 to 360 days depending on the breed, season, and individual mare.
Add 340 days to the breeding or conception date. This gives you the estimated due date, though mares can safely foal anywhere from 330-350 days after breeding.
The earliest safe foaling date is typically around 320-330 days after breeding. Foals born before 320 days are considered premature and may require special veterinary care.
The estimated foaling date is a guideline with a typical window of ±10-15 days. Individual mares may vary based on breed, age, nutrition, season, and previous foaling history.
Yes, but miniature horses and ponies often have slightly shorter gestation periods (around 320-335 days) compared to full-size horses. Consult your veterinarian for breed-specific guidance.
Begin serious foaling preparations around 30 days before the due date. This includes setting up the foaling stall, gathering supplies, and scheduling pre-foaling veterinary checks.
Large breeds, older mares, first-time mothers, and seasonal factors can extend gestation. Mares bred in winter often carry longer than those bred in spring. Up to 360 days can still be normal.
There's no significant difference in gestation length based on the foal's gender. Other factors like breed size, mare's age, and environmental conditions have much greater influence on timing.