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You can burn black walnut for firewood, and it’s actually one of the better hardwoods you can use in a fireplace or wood stove.
That said, there are a few things you should know before you start splitting and stacking it.
Black walnut has some unique characteristics that make it different from other firewoods, both in good ways and in ways that might surprise you.
In this post, we’ll cover whether you can burn black walnut for firewood, how it performs, and what to watch out for.
Let’s get into it.
Can You Burn Black Walnut for Firewood?
Yes, you can burn black walnut for firewood, and it’s a solid choice for heating your home.
Here’s why black walnut works well as firewood:
1. It’s a Hardwood with Good Density
Black walnut is a hardwood, which means it’s denser than softwoods like pine or fir.
This density gives you a longer burn time and more heat output compared to softer woods.
When you burn black walnut for firewood, you’re getting a fuel source that produces steady, lasting heat.
2. Decent BTU Rating
Black walnut has a BTU rating of around 22.2 million BTUs per cord.
That’s not the highest among hardwoods, but it’s still respectable.
For comparison, oak comes in around 24-25 million BTUs, while maple is around 23 million BTUs.
So when you burn black walnut, you’re getting good heat, just not the absolute best.
3. It Burns Cleanly When Seasoned
Seasoned black walnut burns cleanly with minimal creosote buildup.
The key is making sure it’s properly dried before you burn it.
Green or unseasoned black walnut will smoke heavily and create more creosote, which is a fire hazard.
4. Pleasant Aroma
One of the nice perks of burning black walnut is the aroma.
It has a distinctive, slightly nutty smell that many people find pleasant.
It’s not overpowering like some woods, but it adds a nice touch to a winter evening.
Things to Know Before You Burn Black Walnut
While you can burn black walnut for firewood, there are some important considerations.
1. It’s Valuable Wood
Black walnut is prized for furniture making, cabinetry, and woodworking.
A mature black walnut tree can be worth thousands of dollars to a lumber mill.
So before you cut one up for firewood, consider whether it might be more valuable as timber.
If you have a black walnut tree that needs to come down, you might want to call a local sawmill first.
2. Hard to Split
Black walnut can be tricky to split by hand.
The grain can be interlocked and knotty, making it resistant to splitting mauls.
If you’re planning to burn black walnut for firewood, a hydraulic log splitter will make your life much easier.
3. Not the Highest BTU Wood
As mentioned, black walnut’s BTU rating is decent but not top-tier.
If you’re looking for maximum heat output, woods like oak, hickory, or locust will outperform it.
But if black walnut is what you have available, it’ll still keep you warm.
4. Watch for Toxicity Concerns
Black walnut produces juglone, a chemical that can be toxic to some plants and animals.
The wood itself isn’t dangerous to burn, but the sawdust and shavings can be harmful to horses and other livestock.
When you burn black walnut, the juglone is destroyed by the fire, so the smoke isn’t a concern.
Just be careful with the sawdust if you have animals around.
How to Season Black Walnut for Firewood
Proper seasoning is essential if you want to burn black walnut effectively.
Here’s how to do it right:
1. Split It Soon After Cutting
The sooner you split black walnut after cutting, the faster it will dry.
Splitting exposes more surface area, which helps moisture escape.
2. Stack It Off the Ground
Stack your black walnut firewood on a pallet or rack to keep it off the ground.
This prevents moisture from wicking up from the soil and promotes airflow.
3. Cover the Top, Not the Sides
Cover the top of your woodpile to keep rain off, but leave the sides open.
This allows air to circulate and carry moisture away.
4. Give It 12-24 Months
Black walnut typically needs 12 to 24 months to season properly.
You’ll know it’s ready when the wood is light, the bark is loose, and the ends show cracks.
So, Can You Burn Black Walnut for Firewood?
You can burn black walnut for firewood, and it’s a good option if you have it available.
It burns well, produces decent heat, and has a pleasant aroma.
Just make sure it’s properly seasoned, be aware of its splitting challenges, and consider whether the wood might be more valuable for other purposes.
If you’ve got a black walnut tree that needs to come down, you now know you can turn it into firewood that’ll keep you warm all winter.