Firewood by species / Hardwood
Extension tables · checked 2026-10-20
Blue ash firewood
A cord of blue ash holds about 23.8 million Btu of heat, according to the University of Kentucky forestry table (at 20% moisture content). That ranks it #16 of 52 species on this site, 19% more than the 20 million Btu the U.S. Energy Information Administration uses for a generic cord of wood.
- 1Heat per cord 23.8 million Btu
- 2Rank of 52 #16
- 3Weight 2,896 lb/cord
- 4Splitting Excellent
How much heat is in a cord of blue ash?
Only the University of Kentucky table lists blue ash, so its 23.8 million Btu is the one figure used here. It sits 3.1 million Btu above the median species (20.75), and it is #15 of the 38 hardwoods listed, whose average is 22.1 million Btu.
One cord of gambel oak, the highest in the table, holds as much heat as 1.29 cords of blue ash. In the other direction, a cord of blue ash replaces 1.72 cords of buckeye (horsechestnut), the lowest. In energy terms one cord equals the heat content of about 172 gallons of heating oil, using EIA's 138,500 Btu per gallon; the stove and the oil burner each lose some of that before it reaches the room.
Cords of blue ash for a winter
For the example house used across this site (2,000 sq ft, built in the 1970s, wood as the only heat, a 74% efficient stove), a normal winter takes:
| State | Degree days | Blue ash | Generic cord (20 M Btu) |
|---|---|---|---|
| North Dakota (coldest) | 9,184 | 5.8 cords | 6.9 cords |
| Oregon (median) | 5,269 | 3.3 cords | 3.9 cords |
| Florida (mildest) | 646 | 0.4 cords | 0.5 cords |
Because blue ash beats the generic cord, the stack is 16% smaller than the same winter on average wood. Your own house will differ; the calculator takes your state, floor area, house age and price.
Weight, splitting and how it burns
- Weight: Kentucky lists 2,896 lb per cord (22.6 lb per cubic foot of stacked cord, about 1,448 lb for a half-cord pickup load).
- Splitting: rated excellent by Kentucky.
- Water in the living tree: 45% moisture content (Kentucky), among the driest in the table, so it seasons sooner than most.
Whatever the species, the heat figures assume dry wood. Seasoned firewood is below 20% moisture; fresh-cut wood is 35 to 50% water by weight (CMHC), and burning it wastes heat boiling that water off. The seasoning guide and the moisture meter guide explain how to get there and check it.
What a cord of blue ash is worth
Maine's Governor's Energy Office surveyed dealers at $355 a cord on September 21, 2026 (seasoned wood, minimum 2-cord purchase, local delivery included). Paid for as blue ash, that is $14.92 per million Btu in the wood, or $20.16 per million Btu delivered by a 74% stove. It sits in the middle of the table, so a flat per-cord price is roughly fair for it. Only two states publish a dated cord price; see Maine and New Hampshire.
Similar species
- Honey locust: 24.6 million Btu per cord (#14)
- White ash: 24.6 million Btu per cord (#15)
- Black walnut: 22.6 million Btu per cord (#17)
- Mulberry: 25.8 million Btu per cord (#13)
Compare every species on the firewood BTU chart, or see what a cord, face cord and rick hold before you buy.
Sources: University of Kentucky Forestry, Comparison of Properties Affecting Firewood (row "Blue ash"). Last checked 2026-10-20. Price: Maine Governor's Energy Office, 2025-2026 Heating Season Weekly Fuel Prices (September 21, 2026). Method: methodology.