Drying Douglas Fir Firewood (Stacking Guide)
Split Douglas fir to the size you plan to burn, then stack it off the ground with open sides and a rainproof top. Check several pieces with a calibrated pin meter on freshly split faces. Burn the wood only when readings are at or below 20% moisture content. Drying time varies, so let the meter—not the calendar—confirm that it is ready.
Wet firewood can waste heat and raise the risk of creosote buildup in a chimney. If your Douglas fir has been stacked for months, that alone does not prove it is dry. Split size, starting moisture, sun, rain, and airflow all affect the result. I use a simple rule: prepare the stack to dry well, then measure before burning.
Equipment Setup and Safety Prep
Start with a safe work area and the tools suited to the job. A saw and a good stack cannot make up for poor footing or unsafe cutting. Check your equipment, choose a firm, level spot, and plan where cut wood will go before you start.
Prepare the saw and work area
A chainsaw should be used only with the bar, chain, and setup approved in its manufacturer’s manual. There is no universal bar-length or engine-size rule that makes a setup safe for every saw. Check the manual for the correct parts, starting steps, and operating instructions.
Before cutting, wear eye and face protection, hearing protection, chainsaw-rated leg protection, gloves, and boots. Inspect the saw, chain brake, chain tension, bar, and fuel system. Clear the area of people and tripping hazards, and make sure you have a clear escape route.
Use stable supports to hold wood while bucking it to length. Keep the chain out of soil, which can damage it. Stop the engine before making adjustments or clearing a jam. Never use another saw model’s fuel mix, chain details, or tuning figures as a substitute for your own manual.
Field Cutting and Stacking Operation
The goal is to make wood that fits your stove or fireplace, then stack it so air can move around it. Neat rows are easier to inspect and less likely to tip than a loose pile. Build on solid ground and leave enough room to check the wood safely.
Split for your stove and drying conditions
Douglas fir should be split to the size you intend to burn. Smaller splits usually dry faster than larger pieces because more wood surface is exposed to air. But no single split width guarantees that a piece will season by a certain date. Start with the size your appliance can safely take, and split oversized rounds further.
Some rounds split along the grain more easily than others. Knots and twisted grain can make a piece harder to split, so work with a stable round and use a suitable splitting tool. Do not try to force a cut with a chainsaw in a way the saw manual does not allow.
Build an open, stable stack
Place the first course on level rails, a pallet, or another firm support. Keep the bottom of the stack at least 6 inches (15 cm) above the ground. This helps keep the wood away from soil and standing moisture.
For parallel rows, leave about 3 to 4 inches (8 to 10 cm) between them. That gap allows air to pass through, while a stable arrangement keeps the rows from leaning into each other. Keep the stack below shoulder height where practical. Do not climb on it or pull pieces from an unstable face.
Cover the top to shed rain and snow, but leave the sides open. A tarp wrapped around the full stack can trap moisture and slow drying. Keep the stack away from buildings and ignition sources, on a firm, level site where it will not block access.
| Yard condition | Practical stacking choice | Check before leaving |
|---|---|---|
| Limited space | Use a short, stable stack with open sides; avoid packing rows tightly together. | Confirm the base is level and the stack does not lean. |
| Exposed to rain or snow | Cover the top while leaving the sides open. | Make sure the cover sheds water rather than holding it against the wood. |
| Soft or damp ground | Raise the bottom course on stable rails or a sound pallet. | Keep the support level and the wood at least 6 inches (15 cm) off the soil. |
| Several parallel rows | Leave about 3 to 4 inches (8 to 10 cm) between rows. | Check that gaps remain open and the rows are secure. |
Practical yard layouts
These are working layouts, not promises of a set drying time. In a narrow yard, I would favor a modest stack that is easy to reach and keep stable over a tall, crowded pile. In a wet or snowy spot, I would focus on a sound top cover and good ground clearance. In any location, keep the sides open and leave room to inspect the stack.
Maintenance and Moisture Checks
Moisture content is the amount of water in the wood compared with its dry mass. For firewood, the practical target here is 20% or less before burning. A surface reading on bark or an old, weathered end does not reliably show the moisture inside a split.
Measure the fresh split face
Use a calibrated pin meter and follow its instructions for pin placement and reading. If the meter allows a wood-species setting, select the correct setting for Douglas fir. Take readings on a newly exposed split face, not on bark or a weathered end. Place the pins as directed by the meter maker.
Check several pieces from different parts of the stack, including some of the larger splits. A single low reading may reflect one dry piece rather than the whole batch. If readings are over 20%, split a sample piece again and measure its fresh face. Keep drying the stack and test again later.
| Reading on fresh split face | What it tells you | Next step |
|---|---|---|
| At or below 20% | The tested piece meets the target. | Check other representative pieces before burning the batch. |
| Above 20% | The tested piece is still too wet for the stated target. | Keep it stacked with airflow and test again later. |
| Readings vary widely | Pieces may be drying at different rates. | Check more splits, including larger pieces and wood from different stack areas. |
I do not treat a fixed number of months as proof that Douglas fir is ready. Drying time depends on starting moisture, split size, local climate, sun, airflow, and how well the wood is protected from rain. A meter reading gives a more useful answer than a calendar estimate.
Storage and Seasonal Care
Once representative pieces measure at or below 20%, keep the firewood dry and ventilated until use. Moving seasoned wood into a damp, closed space can undo some of the benefit of drying. Keep the stack stable, protected from precipitation overhead, and open along the sides.
Keep the saw ready for the next round
After cutting, clean and store the saw as its manual directs. Follow that manual for chain care, fuel handling, and any storage steps; procedures differ among models. Do not use guessed settings or instructions from another saw.
Check the stack before handling wood
Look for leaning rows, a softened or uneven base, and a cover that has shifted. Repair the setup from a safe position. Never climb onto a stack or pull wood from a face that may collapse. A falling stack can cause serious crush injuries.
If you bring wood into a covered storage area, keep it ventilated and away from ignition sources. Check its moisture again if it has been exposed to rain or stored in damp conditions. The goal is not just to dry the wood once, but to keep it dry until it goes into the fire.
Conclusion
A sound Douglas fir stack starts with safe cutting, splits sized for your appliance, and a stable base at least 6 inches above ground. Leave air gaps between rows, cover only the top, and keep the sides open. Then verify several fresh split faces with a calibrated pin meter. Use the wood when readings are at or below 20%.
Frequently Asked Questions
These answers cover the main choices in drying and stacking Douglas fir firewood. Use the same basic test throughout: check a freshly exposed split face with a suitable pin meter, and judge readiness by measured moisture rather than by how long the wood has been stacked.
How dry should Douglas fir firewood be before burning?
Aim for a moisture reading of 20% or less. Test several representative pieces on freshly split faces.
How long does Douglas fir take to season?
There is no reliable fixed timeline for every stack. Split size, starting moisture, climate, sun, rain, and airflow all affect drying, so verify with a meter.
Can I measure moisture on the bark?
No. Bark and weathered surfaces do not show the moisture inside the wood well. Measure on a freshly exposed split face.
Should I cover a Douglas fir stack?
Cover the top to shed rain and snow, but leave the sides open. Do not wrap or seal the whole stack.
How far off the ground should I stack the wood?
Keep the bottom course at least 6 inches (15 cm) above ground on stable, level supports.
How much space should I leave between rows?
Leave about 3 to 4 inches (8 to 10 cm) between parallel rows to allow airflow.
Do smaller splits dry faster?
Smaller splits usually dry faster because more surface is exposed to air. The right size still depends on what your stove or fireplace can safely take.
Is one low meter reading enough to confirm the stack is ready?
No. Check several pieces from different parts of the stack, including larger splits. A single dry piece may not represent the rest.
(This article was written by one of our staff writers, Samuel Vance. Visit our Meet the Team page.)
