Ash logs are a very dense hardwood with beautiful burning qualities that burn for longer than the other wood species. Ash logs are less available for two reasons. Proportionally there are fewer ash trees than other species and they are used for other applications where they have a higher value. This means firewood manufacturers are often unable to source them for firewood. Looking at the ash logs that are available for sale online today, we recommend that you buy multiple species, where ash species are mixed with less dense species, like mixed hardwood or birch logs.