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Mares are usually in heat (called the Estrus phase) for 3-8 days long, depending on the time of year and whether or not a stallion is present. Early in the year, the mare will normally be in heat for 6 to 8 days but by midsummer only around 4 days.Mares are out of heat for 14-16 days, (called the Diestrus phase) and then return to heat.

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15y ago
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11y ago

A mare is exposed to 16 hours of light and 8 hours of dark for 10 weeks before the desired time of cycling (heat).

Recent studies have shown that it is the 8 hours of dark (rather than the 16 hours of light) that induce heat. This means that interrupting the hours of dark (so that they only receive 8 continuous hours) should have the same effect as leaving the lights on for the entire time.

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13y ago

Mares come in heat every 21 days and it lasts anywhere from 3 days to a week. They do not commonly come in heat in the winter on their own. They can be kept in a controlled environment where a light stays on for a longer period of time and it is warm to make the mare think it is spring and come in heat. This is what many people do with their race horses to breed a foal closer to January 1st.

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Q: How long and how often do mare horses come in heat?
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