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How Long is a Horse Pregnant?

Explore a horse's gestation period, prenatal care, foaling process, and post-foaling care to ensure the wellbeing of both mare and foal during pregnancy.

Published: Mar 19, 2023

How Long is a Horse Pregnant?

A horse's gestation period plays a crucial role in the successful breeding and birth of a healthy foal. In this comprehensive article, we will discuss the gestation period, due date, and important factors to ensure a safe and stress-free pregnancy for your mare.

Horse's Gestation Period

The average gestation period for a horse is approximately 370 days or just over 12 months. However, this period can vary, typically ranging from 326 days to 354 days. It is important to closely monitor the mare during this time to ensure a healthy pregnancy and the birth of a foal in a given year.

Female horses, or mares, are considered seasonally polyestrous animals. This means they have multiple estrous cycles during a specific season, allowing them to produce one foal per pregnancy. The breeding season usually begins in early spring and lasts until late summer. During this time, the mare will cycle every 21 days on average.

Factors Affecting Gestation Period

The gestation period for a horse can be influenced by several factors, including:

  1. Breed: Some horse breeds have slightly shorter or longer gestation periods than others. For example, Thoroughbreds and Arabians may have slightly shorter gestation periods compared to draft horses.

  2. Age: Older mares may have longer gestation periods compared to younger ones.

  3. Nutrition: Proper nutrition throughout pregnancy is essential for the mare's health and the development of the foal. An inadequate diet can lead to complications and may extend the gestation period.

  4. Health: The overall health of the mare can impact the length of the gestation period. Mares with health issues may have longer or shorter gestation periods.

  5. Environmental factors: Changes in temperature, photoperiod, and altitude can affect the gestation period as well.

Monitoring the Due Date

Given the variability in gestation periods, it is crucial to keep a close eye on your mare as the due date approaches. Some signs that your mare is pregnant and nearing her due date include:

  • Swelling of the perineal area

  • Visible movement of the foal inside the mare

  • The mare becoming more restless

  • Changes in the mare's udder, including enlargement and the production of colostrum

To determine the expected due date, it is essential to know the date of conception. This can be done by keeping track of the mare's estrous cycles and noting the date of successful breeding. Once the mare's due date is known, regular check-ups with a veterinarian are crucial to ensure a healthy pregnancy and the wellbeing of the foal.

A stress-free environment is essential during this time to ensure the mare is comfortable and at ease. This includes providing a clean and safe environment, maintaining a consistent routine, and ensuring the mare has access to fresh water and proper nutrition.

Prenatal Care

Prenatal care is critical for the health of the mare and the developing foal. Regular veterinary check-ups, proper nutrition, and vaccinations are essential components of prenatal care. A mare's diet should be adjusted according to her weight, activity level, and stage of pregnancy. Providing a balanced diet rich in essential nutrients, such as protein, calcium, phosphorus, and vitamins, is crucial for the mare and the foal's development.

Vaccinations are another critical aspect of prenatal care. Mares should be up-to-date on vaccinations before becoming pregnant and receive additional vaccinations during pregnancy to protect the foal from potential diseases. Consult with your veterinarian to determine the appropriate vaccination schedule for your mare.

The Foaling Process

As the foaling process begins, the amniotic sac will become visible, followed by the foal's front hooves and nose. In some cases, a red bag may appear, which is an indication of a premature separation of the placenta. This is considered a medical emergency, and immediate assistance from a veterinarian is necessary.

The foaling process can be divided into three stages:

Stage 1: Early Labor

During early labor, the mare may exhibit signs of discomfort, such as pacing, sweating, and looking at her flanks. Contractions will begin, and the mare may lie down and stand up repeatedly. This stage can last anywhere from 30 minutes to several hours.

Stage 2: Active Labor and Delivery

Active labor starts when the amniotic sac is visible, and the foal's front hooves and nose appear. The mare will typically lie down, and strong contractions will help to push the foal out. The entire process of active labor and delivery usually takes 20 to 30 minutes. If the mare is struggling to deliver the foal, immediate veterinary assistance is required.

Stage 3: Expulsion of the Placenta

After the foal is born, the mare will pass the placenta. This process can take up to three hours but should not exceed that time frame. Retained placenta can lead to serious complications and requires veterinary intervention.

Once the foal is born, it is essential to ensure it takes its first breath and begins nursing from the mare within the first couple of hours. Horses typically require no post-partum care, but monitoring the mare and foal closely during the first few days is essential. The foal should be strong and active, and the mare should be attentive to her newborn.

Post-Foaling Care

After the foal is born, both the mare and foal will require attentive care to ensure their health and wellbeing. Some essential aspects of post-foaling care include:

  1. Monitoring the mare for any signs of complications, such as excessive bleeding or signs of infection.

  2. Ensuring that the foal receives colostrum from the mare within the first few hours of life. Colostrum is rich in antibodies and provides the foal with essential immune protection.

  3. Observing the foal's ability to stand and nurse. If the foal is having difficulty standing or nursing, it may be necessary to provide assistance or consult with a veterinarian.

  4. Keeping the mare and foal in a clean, safe environment to minimize the risk of infection and injury.

  5. Scheduling a post-foaling veterinary examination to assess the health of the mare and foal and to address any concerns or issues that may arise.


In conclusion, a horse's gestation period varies, but it is approximately 370 days long. To ensure a healthy pregnancy and a successful birth, it is essential to provide a stress-free environment for the mare and closely monitor her during the pregnancy.

Proper prenatal care, including regular veterinary check-ups, vaccinations, and a balanced diet, is crucial for the mare's health and the development of the foal. Understanding the foaling process and providing attentive post-foaling care will help ensure the wellbeing of both the mare and her newborn foal.

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