The ideal moisture content of firewood is between 15% to 20% According to the Environmental Protection Agency (EPA). The moisture content of freshly cut firewood is generally between 45-65%, which may depend on the species of the tree. To burn the firewood, it is absolutely necessary to reduce that percentage to the recommended level through proper seasoning methods and techniques. A moisture meter will help you track the moisture content throughout the seasoning process until the wood is ready to burn.