Hay fires usually occur within six weeks of baling. Moisture content is the main factor that causes spontaneous combustion in hay, so wet hay is more dangerous than dry hay. 

A hay fire can also damage or even destroy buildings or equipment. The best way to reduce the risk of a hay fire is to bale hay with a moisture content of 20% or less. Keep baled hay dry by covering it or storing it indoors. 

Monitor internal bale temperatures regularly. If you’re unable to cover up the hay, arrange bales so air can circulate between them to help in drying. 

Bales should also be protected from moisture on the ground. Inform fire service personnel of any treatments that have been applied to bales, since smoke from hay treated with an acid preservative may contain toxic fumes.  

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