cycle of mares in cold weather

Question
I have a 5 year mare and long yearling stallion.  If I were to keep them together during the winter, what are the chances of the mare getting bred?  I live where the winters are very cold.  I do not want the mare to get bred but am short on facilities.  Any suggestions would be helpful.
Thanks  

Answer
Hi Jerry,

Actually a mare's cycle will depend on the amount of daylight rather than the coldness of the weather.

Once the daylight hours drop to below 10 hours a day, most mares will stop cycling.  You will usually see mares stop cycling approximately in the months of Sept-Oct and then begin again in approximately March.

This is why people who want to breed mares to have foals in January, which is the universal birth date of a horse, will place their mares under lights during the winter months... to keep them coming into heat and having normal cycles.

Hope that helps!