The risk is spontaneous combustion. Freshly baled hay has a lot of moisture. It also has some good insulating properties. Any stack, pile, collection or bale of organic material runs the risk of spontaneous combustion. As the bacteria goes to work breaking down the bale it creates heat. The insulating nature contains the heat. When the material is thin enough and the heat is not allowed to escape it will start to smolder. That smoker will become a fire.
You see it in oily rags, large woodchip piles and baled hay. If you put the green baled hay up too soon you’ll lose both the hay and the building.
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