Horse Gestation Calculator

This gestation calculator is for information and fun only. The dates that are calculated are an estimate of when to expect your new arrival and should not be interpreted as an exact foaling date.

This Foaling Date Estimator is based on 340 days gestation. You should average plus or minus 10 days for actual foaling window.

Week 2 (2 weeks to 18 days)

First ultrasound or palpation to detect pregnancy

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Week 4 – 1st Month

Second ultrasound or palpation to detect heart beat

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Week 12 – 3rd Month

Give all vaccinations recommended for your area
Worm the mare

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FOURTH MONTH

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Week 20 – 5th Month

First Equine Rhinopneumonitis Vaccination

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SIXTH MONTH

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Week 28 – 7th Month

Second Equine Rhinopneumonitis Vaccination

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EIGHTH MONTH

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Week 36 – 9th Month

Third Equine Rhinopneumonitis Vaccination

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TENTH MONTH

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Week 44 – 11th Month

Give all vaccinations recommended for your area so that mare produces antibodies in colostrum.
Worm the mare
Begin watching for waxing and other signs of early foaling.

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DUE DATE

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Disclaimer: It is the mare owner’s responsibility to consult their vet with regard to broodmare health care. This calendar is only a guideline.

Days In Foal

There is no guarantee or representations as to the accuracy of the calculation.

Horse Gestation Calculator

Days In Foal

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