SawTallyOpen the appHow long does it take to air-dry lumber?
The rule of thumb, and what actually moves it · last checked September 26, 2026.
The old sawyer's rule is about one year per inch of thickness — roughly a year for 4/4 (one-inch) boards, two years for 8/4. It's a starting point, not a promise: species, climate and how you stack it can swing that by months.
What changes the timeline
- Thickness — the biggest factor; drying time rises faster than thickness because moisture has farther to travel out.
- Species — oak and other dense hardwoods dry slowly and check easily; pine and poplar move fast.
- Starting moisture — fresh-cut "green" lumber can be 40–80%+ moisture content and has more to lose.
- Climate & season — warm, dry, breezy conditions dry faster; stacking in late spring beats mid-winter.
- The stack — good stickering and airflow are the difference between drying and molding.
Where air-drying stops
Air-drying pulls lumber down to roughly 12–20% moisture, in balance with outdoor air. That's fine for outdoor and rough work. For indoor furniture you need 6–8%, which means a kiln or a long stint in a heated shop after the air-drying is done.
Stack it right
- Flat, off-the-ground base so the bottom course doesn't wick moisture.
- Dry stickers of equal thickness between every layer, lined up vertically, every 16–24″.
- Weight or cover the top to hold boards flat and shed rain while air still moves through.
Bill the lumber you cut
Whether you sell green or dried, SawTally keeps a running board-foot tally per job and turns it into an invoice on the spot — so you charge for exactly what came off the mill. Free to start, stays on your phone.
General guidance from common drying practice; results vary by species and conditions. Not professional forestry advice.