Let's assume you have done everything right, and the Firewood is neatly split and stacked. The time to season that wood will vary between six to twelve months. The factors that influence the seasoning rate include the type of wood and when it was harvested, and the local ambient humidity. The best time to harvest your Firewood is early Spring before the trees have begun to awaken from their winter slumber. Deciduous trees typically have a longer drying time than Conifers, but the latter burn much faster, requiring more stock.