Horse Gestation Calculator
Estimate when your mare is due to foal.
Frequently asked questions
How long is a horse’s gestation period?
The average horse gestation period is approximately 340 days (about 11 months). However, healthy foals can be born anywhere from 320 to 370 days after conception.
How accurate is this calculator?
This calculator uses the average 340-day gestation period. However, actual foaling dates can vary by several weeks. Factors like breed, mare’s age, and individual variation can affect timing.
What signs indicate a mare is close to foaling?
Signs include udder development, waxing of the teats, relaxation of the muscles around the tailhead, and behavioral changes. Most mares foal at night when it’s quiet.
Should I adjust the date if I know my mare’s history?
Yes, if your mare has consistently foaled earlier or later than average in previous pregnancies, consider that pattern when planning. Keep records of previous gestation lengths.
When should I call the veterinarian?
Contact your vet if the pregnancy extends beyond 360 days, if the mare shows signs of distress, or if you notice any abnormal discharge. Regular prenatal checkups are recommended throughout pregnancy.