White willow firewood: BTU, weight and seasoning

Heat per cord

White willow is a hardwood. At 20% moisture, a full cord holds about 14.6 million BTU of heat (15.4 gigajoules). Wetter wood gives less, because part of the heat goes into boiling off the water.

That ranks white willow 538th of the 558 species in our tables, from the hottest down.

Weight and density

A full cord of seasoned white willow (20% moisture) weighs about 2,370 lb (1,080 kg). Freshly cut, the same cord weighs about 3,230 lb (1,460 kg): the difference is water you don't want to burn.

Its specific gravity, a measure of density, is 0.40. Denser wood packs more heat into each cord.

Seasoning time

Split and stacked off the ground, white willow needs at least 10 months to dry to about 20% moisture.

Wood dries faster once it is split and stacked with air around it. A moisture meter on a fresh split face tells you when it is ready.

How it burns

• Ash: moderate
• Coals: moderate
• Burn time: moderate

We rate white willow 1 out of 10 as firewood: it burns, but denser species give more heat for the same work.

Similar firewood

Other species to compare with white willow:

• Black willow: 15.1 million BTU per cord
• Crack willow: 15.7 million BTU per cord
• Engelmann spruce: 14.4 million BTU per cord
• Nikko fir: 14.4 million BTU per cord

Where these numbers come from

The heat and weight figures come from our firewood tables, worked out the same way for every species at 20% moisture. See how we calculate them.

Questions