To season firewood, cut it to the length your stove or fireplace needs, split it soon after cutting, then stack it off the ground with room for air to move through. Cover the top against rain and snow, but leave the sides open. There is no reliable universal drying time by species: use a moisture meter on the freshly split interior of several pieces and aim for less than 20% moisture before burning.
What “seasoning” firewood means
Seasoning is drying freshly cut wood so it burns efficiently and more cleanly. Freshly cut wood can contain 100% or more moisture content; Cornell Cooperative Extension explains that at 100%, water accounts for half the wood’s weight. Wet wood gives up heat to evaporate that water, produces more smoke and contributes to creosote buildup in a chimney. Cornell recommends burning wood below 20% moisture. Cornell Cooperative Extension
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This article covers firewood, not drying lumber for construction or woodworking. Lumber drying has different requirements and should not be judged by firewood moisture guidance.
How long different firewood takes to season
Use timing as a planning estimate, not proof that a stack is ready. Extension guidance ranges from six months to more than a year, depending on wood, weather and storage. Cornell says green wood takes at least six months to fall below 20%, and damp or shady conditions can make it take longer. Illinois Extension gives six to nine months as a typical minimum. West Virginia University Extension says six months to more than a year depending on weather, wood type and storage.
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| Guidance or observation | What it means |
|---|---|
| At least six months | Cornell Cooperative Extension’s general minimum for green firewood to fall below 20%; damp or shady storage can extend it. Source |
| Six to nine months | Illinois Extension’s typical minimum to get below 20%; it is not a guarantee for every species or site. Source |
| Six months to more than a year | West Virginia University Extension’s range, which varies with weather, wood type and storage. Source |
Why species-specific calendars can mislead
Species matters, but the label “hardwood” or “softwood” does not determine a dependable drying calendar by itself. Piece size, whether the wood was split, when it was cut, local weather and airflow all affect drying. Some hardwoods take longer, according to Cornell; measure the actual wood rather than assuming a species is ready after a set number of months.
A regional example: Interior Alaska
A University of Alaska Fairbanks Cooperative Extension publication, new in November 2025, reports drying observations from a study conducted in Interior Alaska in 2022 and 2023. The table shows days for samples to reach 20% moisture, depending on harvest timing:
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| Species | Before snowmelt | After green-up | Midsummer | After freeze-up |
|---|---|---|---|---|
| Paper birch (Betula neoalaskana) | 102 days | 67 days | 316 days | 382 days |
| White spruce (Picea glauca) | 126 days | 63 days | 298 days | 292 days |
These are study observations for two species in one region, not drying promises for other climates or stacks. The publication notes that year-to-year weather changes drying periods and that early drying conditions were especially influential. University of Alaska Fairbanks Cooperative Extension Service
How to stack wood so it dries
- Cut to your appliance’s usable length. Do this before stacking so you do not have to recut seasoned wood.
- Split the wood promptly. Split pieces dry faster than rounds because more surface is exposed to air.
- Raise the stack off the ground. Use a rack, pallets or another stable support to limit ground moisture.
- Leave gaps for airflow. Stack loosely rather than packing pieces tightly together, and avoid placing the pile directly against a building.
- Cover only the top. A roof or cover sheds rain and snow while open sides let air circulate. Wrapping the whole stack can restrict airflow.
- Choose a suitable location. Cornell suggests keeping a small distance from the home, with 30 feet adequate, because woodpiles can shelter rodents and insects. Follow local fire and storage rules.
For pest prevention, West Virginia University Extension recommends buying firewood locally; check local transport restrictions because rules vary by jurisdiction. WVU Extension
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- CHECK FIREWOOD BEFORE YOU BURN — Test firewood before placing it in your fireplace or wood stove. Knowing the moisture level of your firewood helps you choose wood that is ready for burning and avoid relying on appearance alone.
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- ONE TOOL FOR TWO IMPORTANT HOME CHECKS — Keep it ready for two practical jobs: checking walls for hidden moisture and checking firewood before burning. A simple way to make informed decisions before a moisture problem becomes expensive or wood goes into the fireplace.
How to check whether firewood is ready
Use a meter on a freshly split face
A firewood moisture meter is a practical way to check readiness. Split a few representative pieces and press the meter’s probes into the newly exposed interior, not just the weathered outer surface. University of Alaska Fairbanks Cooperative Extension advises testing wood that is freshly split and not frozen. A shallow reading on an intact piece may miss wetter wood deeper inside, so test more than one piece from the stack.
The target is below 20% moisture. The University of Alaska Fairbanks publication says, “Burning wood with a moisture content between 10% and 20% is the most efficient way to heat while limiting pollution.” The publication
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Do not rely on cracks or sound alone
Checks at the ends of logs and a crisp sound when pieces are knocked together can be clues, but they do not establish that the interior is dry enough. UAF cautions that end checking can appear before moisture falls to 20%; use a meter and freshly split samples for a more direct check. Cornell Cooperative Extension
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Dryness determines whether wood is ready to burn; species influences other trade-offs. Denser, heavier woods generally provide more heat per volume, but can be harder to split or slower to ignite. West Virginia University Extension contrasts oak and hickory with lighter yellow poplar: oak and hickory are heavier and have higher heating values. Consider your available storage, splitting effort, ease of starting, smoke and sparks as well as heat output.
Illinois Extension’s heat values below are figures from its Illinois firewood table, expressed in millions of BTUs per cord. They are locally scoped comparisons, not universal rankings; actual useful heat also depends on proper drying and burning conditions. Illinois Extension
| Illinois-listed wood | Million BTUs per cord |
|---|---|
| Red or black oak | 24.4 |
| White or bur oak | 26.5 |
| Shagbark hickory | 28.6 |
| Hard maple | 23.7 |
| Silver maple | 19.5 |
| Sycamore | 20.7 |
| Osage orange | 30.7 |
| Black locust | 28.1 |
| Green ash | 23 |
| Black walnut | 22.3 |
Burning wood safely in your appliance
Use dry firewood that meets your stove or fireplace manufacturer’s requirements. University of New Hampshire Extension notes that newer catalytic stoves require dry wood and that green wood may damage a catalytic combustor. Follow the operating and maintenance instructions for your specific appliance. UNH Extension
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