Kiln dried vs seasoned firewood
Kiln dried wood is dried in days in a heated chamber; seasoned wood air dries for months. What each costs here, and when the extra money is worth it.
Kiln dried firewood is dried in a heated chamber for a few days. Seasoned firewood is split and air dried outdoors, usually for 6 months to 2 years. Both can burn well. The difference is how dry the wood reliably is, whether it carries insects, and what it costs.
| Kiln dried | Seasoned | |
|---|---|---|
| Drying time | Days | 6 months to 2+ years |
| Typical moisture | Often under 20%, and consistent | Depends on the seller and the weather |
| Insects | Killed by the heat when treated to the USDA standard | Can carry pests |
| Can you move it? | Certified heat treated wood is accepted by many parks and states | Often restricted outside the local area |
| Suppliers on this site | 192 | 609 |
| Middle listed price per full cord | $529 (53 suppliers) | $440 (161 suppliers) |
The USDA's heat treatment standard for firewood is 60°C (140°F) at the core of the wood for 60 minutes. Only wood labeled as certified heat treated has been checked against it. Plain "kiln dried" on a bag doesn't guarantee that.
When kiln dried is worth it
- You burn indoors occasionally and want wood that lights on the first match.
- You cook with it. Pizza ovens and smokers need very dry wood to reach temperature.
- You're taking it camping, and the park requires heat treated wood.
- You need it ready tonight and can't wait for wood to dry.
When seasoned makes more sense
- You heat your home with wood and buy several cords a year. The price difference adds up fast.
- You have room to store it and can buy early. Wood delivered in spring will be drier by winter.
- You'll check it with a moisture meter. See how to tell if firewood is seasoned.