Seasoned vs. Green Firewood: Why the Wood Matters

Most people have never burned truly well-seasoned wood. They think they have. The fires they remember as “okay” were actually fires handicapped by water.

This post is about the most boring, most important thing in firewood: moisture content. Everything about how a fire performs — how it lights, how hot it burns, how much smoke it throws, how long it lasts, how clean it smells — comes back to how much water is in the wood.

If you understand this one thing, you can walk up to any woodpile in your life and know in five seconds whether the fire is going to be good or bad. It is a small, life-long skill.

What "seasoned" actually means

A living tree is, by weight, roughly 50% water. When you cut it down, the water doesn't leave — it stays in the cell walls of the wood. That wood, freshly cut, is called "green." You can burn green wood. It burns badly.

"Seasoning" is the process of letting that water evaporate over time. Wood is split (exposing more surface area), stacked (allowing airflow), and left outside for months. As it dries, the moisture content drops. Properly seasoned firewood has a moisture content below 20%. That's the number. That's the whole game.

Achieving 20% typically requires:

• At least 6 months of drying for softer hardwoods like maple or cherry
• 12 months for dense hardwoods like oak or hickory
• Proper stacking — off the ground, covered on top but open on the sides for airflow
• Split into pieces no thicker than about 6 inches

Wood that's been sitting in log form on the ground for two years is not seasoned. It's rotted on the outside and still wet on the inside. Seasoning requires the wood to be split, which exposes the interior surfaces to air.

Why water ruins a fire

Here is what actually happens when you try to burn wet wood. Physics, not opinion.

First, a significant amount of your fire's heat energy is spent evaporating the water out of the wood. Every ounce of water in your log has to be boiled off before the wood underneath can burn. This is why wet wood hisses — that's the sound of steam escaping. It's also why wet wood feels like it's "fighting" the fire.

Second, the steam cools the fire. A fire that could be burning at 1,600°F on dry wood burns at 1,200°F on wet wood. This lower temperature means incomplete combustion — you're burning the wood, but you're also producing a lot of unburnt particulates, which is what smoke is.

Third, those unburnt particulates condense in your chimney or flue as creosote. Creosote is the tarry black substance that causes chimney fires. If you burn wet wood in an indoor fireplace over a full winter, you will have a creosote problem. This is not theoretical. Chimney sweeps in the Midwest are busy every November cleaning out the mistakes of people who bought wood in September.

Fourth, wet wood produces far less heat. A cord of seasoned oak contains about 24 million BTUs. A cord of green oak? Closer to 14 million. You're paying for wood and getting 60% of the heat.

Fifth, it smells. The clean, sweet smell of a hardwood fire — the one that imprints on your memory — requires clean combustion. Wet wood produces acrid, gray smoke that burns your eyes and makes you smell like a house fire instead of a cabin weekend.

How to tell at a glance

Professional wood dealers use moisture meters — cheap handheld devices that read the water content of a piece of wood. You don't need one. You need to know what to look for.

You don't have to use all five. Any two of them, together, are reliable.

The tricks people play

The firewood market has its share of bad actors, and knowing the tricks is useful.

"Seasoned" at a roadside stand. The word has no legal definition. Anybody can call anything "seasoned." At roadside stands in September, "seasoned" often means "cut in July." It has been drying for two months and is essentially still green. Use the five tests above.

The top layer is dry, the rest isn't. A pile that's been sitting covered for a month has dry wood on top and wet wood below. Always check pieces from deep in the pile, not just the ones on display.

Kiln-dried wood sold as seasoned. This is actually fine — kiln-drying is a legitimate, fast process that produces 15% moisture wood. It's just more expensive than air-seasoning, and some dealers mark up kiln-dried to seasoned prices without disclosing the difference. Kiln-dried is labeled as such if the dealer is honest.

Bundles at gas stations. These bundles — usually shrink-wrapped, from some distant state — are often kiln-dried and reasonably dry, but they're also expensive per cord equivalent and raise the emerald ash borer issue (covered below). They're fine for a single campfire on a road trip. They're a bad value for a weekend at a cabin.

The Ohio-specific issue: emerald ash borer

This is the rule that nobody tells you about, and it matters. The emerald ash borer is an invasive beetle that hitchhiked to the US around 2002 in wooden shipping pallets from East Asia. Since then, it has killed hundreds of millions of ash trees across the Midwest. Ohio has lost most of its mature ash trees in the last twenty years.

The primary way the ash borer spreads is in firewood. A single infested log, moved 200 miles, can seed a new outbreak. To slow the spread, Ohio and surrounding states have restrictions on firewood transport — generally, don't move firewood more than 50 miles from where it was cut, and never across state lines without certification.

In practical terms, for a Hocking Hills cabin trip: don't bring firewood from home. Buy it locally when you arrive. The exception is USDA-certified, heat-treated kiln-dried wood, which is safe to transport. Plain seasoned wood from your backyard is not.

Our wood is cut within about 15 miles of where we deliver it. No transport concerns, no quarantine issues, and you're supporting a local supply chain that doesn't threaten the remaining ash trees in the area.

The different species, ranked

Not all hardwoods are equal. Here's how they actually compare, from best to worst for a cabin fire:

• Oak (white or red): The gold standard. Dense, hot, long-burning, neutral smell. Needs 12+ months of seasoning.
• Hickory: Nearly as hot as oak, with a sweet distinctive smell. Best for cooking.
• Ash: Burns well even less-than-fully-seasoned (old hunter's trick). Mild smell. Getting rare because of the ash borer.
• Hard maple (sugar maple): Long burn, clean. Good middle-tier choice.
• Cherry: Beautiful, slightly sweet smell. Doesn't last as long as oak but is one of the most pleasant to sit around.
• Birch: Lights easily, burns fast. Good kindling, mediocre main fuel.
• Softwoods (pine, cedar): Fine for kindling. Bad for main fuel. Never cook over them.

Most mixed hardwood firewood in the Hocking Hills is primarily oak, hickory, maple, and cherry — the species that dominate these forests. You're getting the best hardwood mix in Ohio when you buy locally here, by virtue of what grows in these hollows.

The wood is the whole thing. If you've ever had a fire that just "didn't feel right" — too smoky, too short, too much work — it almost certainly wasn't the fire's fault. It was the fuel. Get the fuel right and the fire takes care of itself. Which, if you think about it, is how fires have worked for a million years.