How Long to Season Firewood (and How to Tell It's Ready)
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Fresh-cut ("green") firewood can be half water by weight. Burning it wastes heat on boiling water, makes more smoke and builds creosote in your chimney. Seasoning simply means letting that water dry out.
The target: under 20% moisture
The U.S. EPA's Burn Wise program says wood burns best at a moisture content below 20 percent, and recommends seasoning wood for at least six months (EPA Burn Wise). (EPA stopped updating the Burn Wise site on October 30, 2025; the guidance remains online as an archive.)
Six months is the minimum. How long it really takes depends on:
- Species and density. Dense hardwoods such as oak dry more slowly than lighter woods such as pine, aspen or cottonwood.
- Split size. Split wood dries much faster than rounds, because water leaves mostly through the ends and split faces.
- Climate and stacking. Sun, wind and dry air speed things up. Shade, humidity and tight piles slow them down.
Because drying time varies so much, a moisture reading, not the calendar, is the real test of whether wood is ready.
How to stack wood so it dries
- Split it first.
- Stack it off the ground on pallets or rails.
- Cover only the top and leave the sides open — EPA notes that covering the sides traps moisture in.
- Single rows with gaps between them dry faster than one big pile.
- Put the stack where it gets sun and wind.
How to tell if it's ready
- Use a moisture meter. Split a piece and test the freshly exposed face, not the outside. Under 20% is ready.
- Look at the ends. Seasoned wood is darker and often has cracks (checks) radiating from the center.
- Feel the weight. Dry pieces are noticeably lighter than green ones of the same size.
- Knock two pieces together. Dry wood sounds hollow; wet wood sounds dull.