Lumber that will be used as firewood needs to fully dry out to avoid excessive smoke production and corresponding health risks. Usually, a moisture content of 20% or less is recommended while freshly cut wood comes with up to 100%. To check whether the wood is dry enough for burning, you should have a look at the cuts – if they look dried out and start cracking, it is a good sign. If you prefer being on the safe side, you can use a moisture meter and measure the moisture content (source).
As a rule of thumb, freshly cut wood stacked outside in spring should be good for burning in fall or winter (drying time 6 to 9 months). However, it may take firewood 12 months and more to dry if you do not split it properly or store it inside, e. g. in a barn or shed.
Therefore, make sure you split it quickly – read our powered log splitter reviews for more details – and familiarize yourself with these expert tips on how to season wood quicker.