Is Ash Good Firewood? BTU Numbers, Seasoning Time & EAB Rules

Ash is one of the best all-around firewoods you can burn – it delivers 20 to 24 million BTUs per cord, splits easily, and throws very few sparks, but only once it is seasoned below 20% moisture. Burn it green and you lose heat to steam, get heavier smoke, and build up creosote faster. This guide covers real BTU numbers by ash species, how long seasoning actually takes, what a cord weighs, and the firewood-transport rules the emerald ash borer left behind.

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Is Ash Good Firewood? Real BTU Numbers by Species

Yes – ash is a hardwood with a dense, straight grain, and it produces 20-24 million BTUs per cord depending on the species. White ash, the type most commonly sold and cut for firewood, is the strongest performer at roughly 24 million BTUs per cord. Green ash runs closer to 20 million, and black ash, the lightest of the three, comes in around 18 million BTUs per cord.

Wood	BTU per Cord (millions)	Seasoning Time	Best For
White Ash	~24.2	6-12 months	Everyday heating
Green Ash	~20.0	6-12 months	Everyday heating
Black Ash	~17.9-18.0	6-9 months	Shoulder-season fires
Oak	24.5-27.0	12-24 months	Overnight burns
Hickory	26.0-29.0	12-24 months	Max heat output
Maple	22.0-24.0	6-12 months	General use
Pine	17.0-19.0	3-6 months	Kindling / quick fires

Ash sits in a practical middle ground: it burns nearly as hot as oak but seasons in half the time, which is why a lot of full-time wood burners keep it as their default species rather than saving it for special fires. For a closer look at how the BTU numbers stack up across a full cord, see our ash wood BTU breakdown, and if heat intensity specifically is your question, check whether ash burns hot enough for your stove.

How Long Does Ash Wood Take to Season?

Ash needs 6 to 12 months of proper seasoning before it burns cleanly. That is fast for a hardwood – oak and hickory both need 12 to 24 months to reach the same moisture level. Here is the process that gets ash ready on schedule:

1. Cut and split soon after felling: split logs to 4-6 inches in diameter within a few weeks of cutting so the exposed inner wood can start drying immediately.
2. Stack off the ground: use pallets or a rack so ground moisture cannot wick back into the bottom row.
3. Leave the sides open: stack in single rows with gaps between pieces; airflow through the pile matters more than sun exposure.
4. Cover only the top: a tarp or shed roof over the top keeps rain off without trapping moisture inside the stack.
5. Check with a moisture meter: test a freshly split face at 6 months; ash is ready to burn once readings are consistently under 20%.

If you want the full month-by-month timeline and climate-specific adjustments, our ash seasoning timeline guide covers it in more depth.

What a Cord of Ash Actually Weighs

A cord of seasoned white ash weighs about 3,500 pounds. Green, freshly cut ash is heavier at roughly 3,960 pounds per cord – the difference is almost entirely water weight that leaves the wood during seasoning. That 460-pound swing matters if you are hauling wood in a pickup: a full cord of green ash can push a half-ton truck close to its payload limit, while the same cord seasoned is a noticeably easier load.

Data point: seasoned white ash averages 3,500 lbs per cord versus 3,960 lbs green – about a 12% weight loss from drying alone. Source: firewood weight comparisons compiled from forestry and hearth industry data, 2026.

Emerald Ash Borer: The Firewood Rule People Get Wrong

A lot of older articles still say ash firewood is under a federal quarantine – that is out of date. The USDA formally removed the national emerald ash borer domestic quarantine in December 2020 because the beetle had already spread too far for a federal boundary to contain it. That does not mean you are free to move ash firewood anywhere: many individual states, counties, and campgrounds kept their own restrictions in place, and moving firewood across those lines can still carry real fines.

• Check your destination state or campground’s current firewood rules before transporting ash logs, even locally.
• Buy firewood at or near where you plan to burn it rather than bringing it from home.
• Kiln-dried, heat-treated firewood is generally exempt from local restrictions since the heat kills EAB larvae.

“Buy it where you burn it. Firewood is one of the primary ways destructive forest pests like emerald ash borer move into new areas.”

How to Identify Ash Firewood Before You Burn It

Knowing you actually have ash matters for both burn quality and EAB awareness. Split ash shows a pale cream to light brown heartwood with a straight, open grain – it splits in clean, predictable lines rather than twisting like elm. On standing trees, look for gray bark with a tight diamond-shaped furrow pattern, branches that grow directly opposite each other on the trunk, and compound leaves with 5 to 11 smooth-edged leaflets. If you are buying rather than cutting your own, well-seasoned ash will sound hollow when two pieces are knocked together and feel noticeably light for its size.

Common Mistakes When Burning Ash Wood

• Burning it too soon: ash cut and split in spring is rarely ready by the following winter’s first cold snap – plan a full 6-12 month season, not a few weeks.
• Stacking it tight against a fence or wall: blocking airflow on one side slows drying on that whole row, even if the rest of the pile looks seasoned.
• Assuming light-colored wood means it is dry: color fades with age but is not a moisture reading – use a meter on a freshly split face instead of guessing by look.
• Transporting it without checking local rules: even with the federal EAB quarantine gone, some states still fine you for moving untreated ash firewood across county or state lines.

Is ash good firewood compared to oak?

Yes, though oak edges it out on raw heat: oak produces 24.5-27 million BTUs per cord versus ash’s 20-24 million. Ash seasons in about half the time (6-12 months versus oak’s 12-24 months), which makes it the more practical choice if you cannot store wood two years ahead.

Does ash wood produce a lot of smoke?

No, properly seasoned ash burns with a bright flame and relatively low smoke compared to softwoods like pine. Smoke and creosote buildup both increase sharply if the wood is burned before it is fully seasoned, so moisture content matters more than species here.

Can I burn ash wood that is still green?

You can, but you should not. Green ash wastes much of its heat output boiling off internal moisture, smolders instead of burning cleanly, and builds creosote in the flue far faster than seasoned wood. Wait until moisture readings are consistently under 20% before burning it.

Is it legal to move ash firewood across state lines?

It depends on where you are going. The federal emerald ash borer quarantine ended in December 2020, but many states, counties, and individual campgrounds still restrict bringing in untreated firewood to slow the beetle’s spread. Check the destination’s current rules before transporting ash logs, and when in doubt, buy firewood locally instead.

How much does a cord of ash firewood cost?

Pricing varies by region, but ash typically sits in the mid-range for hardwood firewood – usually a bit less than oak or hickory because it is more abundant and seasons faster for sellers to turn over. Buying seasoned, ready-to-burn ash usually costs more per cord than buying it green and seasoning it yourself.

Conclusion

Ash earns its reputation as one of the better all-around firewoods: 20-24 million BTUs per cord, a 6-12 month seasoning window that is fast for a hardwood, easy splitting, and low sparking. The trade-offs are real but manageable – confirm your wood is actually below 20% moisture before you burn it, and check local firewood-transport rules if you are hauling it any distance, since state-level EAB restrictions outlasted the federal quarantine.