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Pony Gestation Calculator

This pony calculator uses 330 days as its pregnancy average, with a 320 to 360 day planning window after breeding. Enter the breeding date below.

Estimation Method

Pony gestation at a glance

Average used by this calculator330 days (about 10.8 months)
Window shown by this calculator320 to 360 days after breeding
Due date formulaBreeding date + 330 days
Birth is calledFoaling
MotherMare
YoungFoal

The 330 day figure closely matches a small Shetland study, not a pony-wide normal range. Six Shetland mares foaled between days 312 and 338, and a study of embryo-transfer pregnancies carried by Hokkaido native ponies and Hokkaido-Haflinger crosses recorded seven gestations lasting 332 to 359 days, so prepare before this calculator's 320 to 360 day planning window opens.

Pony pregnancy timeline

Days 12 to 16 after ovulationA pony pregnancy was first seen by ultrasound in a research study.
More than 22 days after ovulationThe fetal heartbeat could be seen in the study mares.
More than 39 days after ovulationSpontaneous fetal movement was seen in the study mares.
From day 101Researchers collected fetal measurements in five Shetland mares; this is a study milestone, not a home pregnancy check.

Frequently asked questions

How long is a pony pregnant?

The pony calculator uses 330 days and a 320 to 360 day Foaling Planning Window. A small Shetland study reported a 329.5 day average but births from day 312 to 338; a study of embryo-transfer pregnancies carried by Hokkaido native ponies and Hokkaido-Haflinger crosses recorded 332 to 359 days.

How do I calculate a pony foaling date?

Enter the breeding date and the pony calculator adds 330 days for an estimated foaling date, then shows its 320 to 360 day Foaling Planning Window.

Are pony foaling signs different from horse signs?

No pony-specific list of foaling signs was found. A small Shetland study found differences from larger mares in hormones and heart rate before foaling; ask your veterinarian which signs to watch.

When should I call a veterinarian during pony foaling?

Merck general equine guidance, not pony-specific advice, says that after the water breaks, call your veterinarian if there is no significant progress within 10 to 15 minutes, and immediately if the foal is not delivered within 30 minutes. If the membrane that first appears at the vulva is bright red and velvety instead of pale and white, the placenta has separated early; Merck says it must be broken open immediately and the foal delivered, or the foal will not get enough oxygen. Call your veterinarian immediately.

Sources

Reviewed by Elliott Garber, DVM · Last reviewed