While the weather is still nice, check your horse's winter housing. If your horse will have access to a runin shed, it should be cleaned out now. Remove old bedding and manure, and rebed the shed with 48 inches of fresh bedding. Check the drainage to be sure that water will not run into the shed. Make sure there are no loose boards or nails in the shed.
Horses are active and prone to injuries.
The runin shed also should be adequate for the number of horses, allow at least 80 square feet per horse. If you plan to put your horse in a stall if the weather gets bad, clean it out and make necessary repairs to remove any risks. After the horse's housing is in tiptop shape, check your horse, which should also be in tiptop condition before winter. The horse should have an adequate amount of body fat to insulate against winter's cold wind, rain and snow. You can use a visualhandson system to evaluate body condition.