White Ash Firewood Drying Time (Moisture Test)
White ash may air-dry in about 6–12 months when conditions are favorable, but time alone cannot show that it is ready to burn. Split a sample and test the fresh inner face with a suitable pin meter. Aim for 20% moisture content or less, using the meter’s instructions and any ash or temperature corrections it provides.
If you sell firewood, a moisture reading can help buyers judge whether the wood is ready to burn. It does not guarantee a higher resale price, and one low reading is not proof that a whole stack is dry. For your own stove, the same check helps avoid burning wood that still holds too much water.
Wet wood uses heat to drive off moisture, leaving less heat for the home. It can also contribute to poor burning and creosote buildup in a chimney. White ash can dry relatively quickly in good conditions, but split size, weather, airflow, and stacking all affect the result. I treat the calendar as a planning tool and the meter as the readiness check.
Moisture Meter Setup and Sampling Safety
A moisture meter estimates water content in wood. For firewood, use a pin-type meter that can read the expected range, and follow its manual for species settings, pin depth, and temperature correction. These details matter: a reading from the wrong surface or setting may not describe the wood you plan to burn.
Before testing, wear eye protection, gloves, and sturdy footwear. Keep other people clear of the splitting area. If you use a saw or powered splitter, follow the machine’s guarding and operating instructions.
Choose a meter and set it correctly
A pin meter measures electrical resistance between its pins and uses that result to estimate moisture content. Check the manual to see whether the meter has a white ash setting. If it does, select it. If it does not, follow the maker’s guidance for a suitable setting; do not assume a generic setting is exact for every species.
Wood temperature can affect some meter readings. Let the meter and wood reach conditions listed in the instructions, or apply the stated temperature correction. Use the pin depth the manual calls for. A reading taken too close to the surface may not reflect moisture deeper in the piece.
Meters differ. Their range, correction options, and directions are not interchangeable. Read the manual before testing, especially if the display is near the meter’s upper or lower limit.
Make a representative sample
Choose at least three pieces from different parts of the stack. Include pieces that seem typical of the load, rather than selecting only the smallest or driest-looking splits. Split each piece again just before testing. The newly exposed face shows the interior, where moisture can remain after the outside has dried.
Take two readings per piece, for at least six readings in total. Follow the meter manual for pin placement and depth. Avoid testing only bark, an old weathered face, or a visibly cracked end. A dry outer surface can hide a wetter core.
I have seen the outside of a split look ready while a fresh split face gives a higher reading. That is why I do not use a surface check as the final decision. Takeaway: set the meter correctly, sample several pieces, and test fresh interior wood.
Splitting, Stacking, and Air-Drying White Ash
Air-drying means allowing moisture to leave split wood through exposure to moving air. White ash may dry in roughly 6–12 months under favorable conditions, but that is a broad estimate, not a deadline. Split dimensions, local weather, airflow, sun exposure, and stack design can make the actual drying period shorter or longer.
Split to the size you will burn
Split ash soon after cutting, then split it to the size you expect to use. Smaller pieces have more exposed surface area compared with their volume, which can help them dry faster. Large rounds and oversized splits tend to dry more slowly because moisture has farther to move from the center.
Choose a consistent size that suits your stove or fireplace instructions and your handling needs. There is no single split size that guarantees a set drying time. If you change the size after stacking, give the newly exposed wood time to dry and test it again before burning.
Stack for airflow and rain protection
Keep the stack off the ground on a raised base. Leave the sides open so air can move through and around the wood. Cover the top to shed rain, but do not wrap the stack or seal it in a way that blocks airflow.
A breezy, rain-sheltered spot is a useful choice. Sun exposure can help, but it cannot make up for poor airflow or a stack that keeps getting wet. Arrange the rows securely, and avoid placing the stack where it creates a hazard or blocks access.
| Yard condition | What it can mean for drying | Practical response |
|---|---|---|
| Small, evenly split pieces | More exposed surface than large splits | Stack with gaps for airflow |
| Large splits or rounds | Moisture may remain inside longer | Split to the intended burning size |
| Stack raised off the ground | Less contact with damp soil | Keep the base stable and dry |
| Top covered, sides open | Rain is shed while air can pass | Cover the top only |
| Wrapped or fully enclosed stack | Air movement is restricted | Open the sides and allow airflow |
A representative yard check can clarify the process. Suppose a stack has been outside for several months and the ends look dry. That appearance alone does not establish readiness. Split three typical pieces, take two readings per piece, and judge the set of results against the 20% target. This is an example of a testing method, not a claim that every stack will dry in the same number of months.
Takeaway: split early, stack off the ground, and protect the top without closing off the sides.
Moisture Testing, Interpretation, and Retesting
A moisture reading is a check of the sampled wood, not a guarantee for every split in the pile. For firewood, aim for 20% moisture content or less. Test representative pieces on a newly split face, and use the meter’s instructions to interpret the displayed percentage and any corrections.
Read the interior, not the weathered outside
Pick pieces from different parts of the stack, such as the top, middle, and lower rows. Split each one again just before measuring. Place the pins on the fresh interior face as directed by the manufacturer. Take two readings per piece, using the prescribed pin depth and temperature correction.
Do not rely on a low reading from bark or a weathered surface. The outer wood can dry before the core. If only the outside is tested, the result may suggest readiness even though the inside remains too wet.
Decide what to do with the readings
Compare the readings with the 20% threshold. If representative readings are above 20%, continue drying and test again later. If readings are 20% or lower, the tested pieces meet the target, provided the meter was set and used correctly. Lower readings can be acceptable when measured properly.
| Result from the sample | What it tells you | Next step |
|---|---|---|
| Readings are above 20% | The tested pieces remain wetter than the target | Continue drying; retest fresh interior faces later |
| Readings are mixed, with some above 20% | Drying may be uneven across the stack or pieces | Keep drying and sample more representative pieces |
| All readings are 20% or lower | The sampled pieces meet the target | Store them dry and check other batches separately |
| Outside reads low, fresh split face reads high | The exterior dried faster than the interior | Use the interior reading; continue drying |
Do not average away a high reading without considering it. A set of mixed results may mean some pieces are ready while others need more time. Keep separate batches apart when practical, and test the wood you intend to burn rather than relying on a reading from a different stack.
Retest when conditions or batches change
Retest after additional drying, especially if weather has been wet or the stack was moved or covered differently. Also test new deliveries or separate stacks as their own batches. A result for one stack does not confirm that another stack has the same moisture content.
In my routine checks, the useful question is not “Has it been stacked long enough?” but “What do fresh interior readings show now?” Takeaway: use the measured result, not elapsed months, to decide whether the tested wood has reached the target.
Seasonal Storage and Keeping Dry Firewood Dry
Seasonal storage protects firewood after it has dried. Wood that met the target can take on moisture again if it is left exposed to rain or stored where air cannot move. Keep the same basic balance: shed water from above, allow airflow around the sides, and keep the stack raised from the ground.
Store dry wood apart from wood still drying
If possible, separate wood that has passed the moisture check from wood still drying. This reduces mix-ups when you bring fuel indoors and makes it easier to track which batch was tested. Keep a simple note of the date, stack, and readings; it helps you compare results without treating a past test as permanent proof.
Bring in only the amount you can store safely and keep dry. Avoid enclosing the main outdoor stack in plastic or another cover that blocks side airflow. If the stack gets soaked or its storage conditions change, split and test a few representative pieces again.
Keep the measurement useful
A meter reading is only as good as the sample and method. Use the same basic procedure each time: select several typical pieces, split them fresh, and take two readings per piece. Follow the meter guide for species, temperature, and pin depth. This makes one test more useful to compare with the next.
The practical rule is simple: dry time is an estimate, while a correct interior moisture test is the readiness check. Keep the stack ventilated, test at least three pieces, and continue drying if representative readings exceed 20%.
Frequently Asked Questions
How long does white ash take to dry for firewood?
It may air-dry in about 6–12 months under favorable conditions. Treat that as an estimate, not proof; measure the moisture content.
What moisture level should white ash reach before burning?
Aim for 20% moisture content or less. Follow the meter instructions and use any species or temperature corrections it provides.
Can I test the outside of a split?
No. A dry surface can hide a wet core. Split the sample again and test the fresh interior face.
How many pieces should I test?
Test at least three representative pieces from different parts of the stack. Take two readings per piece.
Do I need a pin-type moisture meter?
A pin-type meter is suitable when it covers the expected moisture range. Use it as directed by its manufacturer.
Should I use a white ash setting on my meter?
Yes, if the meter provides one. If it does not, follow the manual’s guidance for species selection and do not assume an uncorrected reading is exact.
Does a low reading mean the whole stack is dry?
No. It describes the sampled pieces. Test several typical splits, and check separate stacks or batches on their own.
What should I do if some readings are over 20%?
Keep the wood drying and retest later. Mixed readings can mean moisture levels vary between pieces.
Can white ash dry in less than six months?
It may do so in favorable conditions, but there is no reliable calendar shortcut. Use correctly taken interior readings to check readiness.
Will covering the stack help it dry?
Covering the top helps keep rain off. Leave the sides open for airflow, and keep the stack raised off the ground.
(This article was written by one of our staff writers, Samuel Vance. Visit our Meet the Team page.)
