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Yes they can spontaneously combust but the circumstances where that can occur are very specific and hay bales stacked outside in a small pile cannot.
Spontaneous combustion of hassle baffles occurs when damp hay is baked and stored in a dry barn in a large stack. Mold can form on damp hay and it creates a small amount of heat as it grows. The stack has to be large enough to trap the heat from escaping and dry enough so that when the heat reaches a high enough temperature the hay will start to combust. This problem is almost exclusive to barns and large scale hay operations.
There is no way a couple of bales stacked outside will ever burst into flames. Please don't let this fear stop you from doing anything or keep you running crazy putting tarps on top of a couple of bales that you have outside.
I second @BY Bob reply. I used to bale 7 acres of hay for my horse twice a year and have had bales spontaneous combust. The reason is because the hay did not dry enough before being baled. We used to use a piece of 1" pvc pipe jammed into the center of our stack and run a thermometer down to check the temperature.
You may even do better with straw instead of hay. There is less leaf in straw and therefore less mold opportunity. Plus there should be minimal seeds in the straw so you won't have hay growing in your yard next year.
Thank you for backing me up. The most money I made as a young teenager was baling hay for farmers. We always did it in August because it was so hot and most importantly, dry. But that of course made it miserable work.
This is just a small sample of the hay I've baled. This was my barn with my ex-husband. View attachment 1988758
Thank you for sharing your expertise friends
